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Scott Weese

@scottweese.bsky.social
393 followers 18 following 374 posts

Infectious disease vet. Girl's hockey coach. Herder of (or herded by) critters and daughters

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Scott Weese @scottweese.bsky.social · 08/10/2026
Full thoughts here: www.wormsandgermsblog.com/2026/10/arti...
wormsandgermsblog.com
Vaccination part 6: how much is too much?
I took a short break from the series of vaccination posts, but I have a couple more topics to go over so we’re not quite done. In Part 5, I talked about
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Scott Weese @scottweese.bsky.social · 08/10/2026
Part 6 of our vaccination series: how many vaccines at once are too many? Short answer: There's no practical limit. It's been estimated that the body can response to thousands of vaccines at once, so the combinations we would use in animals (and ppl) are not an issue. 1/2
wormsandgermsblog.com
Vaccination part 6: how much is too much?
I took a short break from the series of vaccination posts, but I have a couple more topics to go over so we’re not quite done. In Part 5, I talked about
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Scott Weese @scottweese.bsky.social · 05/10/2026
The problem is, we often go from expert (evidence-light) opinion to ingrained (thou shalt do this) with no steps in between. Here's a link to a commentary about the need for study of this important (and vexing) topic: www.wormsandgermsblog.com/2026/10/arti...
wormsandgermsblog.com
Lyme disease treatment duration in dogs
I've nearing the end of my series on vaccination (at least one more topic to come), but I'll change it up here with some short information about
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Scott Weese @scottweese.bsky.social · 05/10/2026
What is our treatment duration for Lyme disease in dogs based on? No data...just expert opinion. That's not inherently bad since you need to start somewhere and expert opinion is a good start. However, it should be followed with proper study to optimize it. 1/2
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Scott Weese @scottweese.bsky.social · 03/10/2026
Full thoughts here: www.wormsandgermsblog.com/2026/10/arti... 4/4
wormsandgermsblog.com
Vaccination scenarios part 5: splitting vaccines
I'm going to recycle a post from earlier this year since it fits nicely with this series (and I'm lazy). It's a good topic because splitting
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Scott Weese @scottweese.bsky.social · 03/10/2026
It's probably not a huge difference either way but the added cost, stress and hassle of splitting vaccines for no real evidence of a benefit needs to be considered. Splitting vaccines is probably best to see if there's a specific vaccine a known reactor is reacting to. 3/n
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Scott Weese @scottweese.bsky.social · 03/10/2026
...if you have to vaccinate on another day to give the 2nd vaccine, you add another day's risk that wouldn't have been there if you gave all at once. Data are pretty crude but it's plausible splitting vaccines increases overall risk. 2/n
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Scott Weese @scottweese.bsky.social · 03/10/2026
Part 5 of our vaccination series...dogs splitting vaccines reduce the risk of adverse events. Short answer: Giving 1 vs 2 vaccines on a given day might reduce the risk of a vaccine reaction on that day, but.... 1/n
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Scott Weese @scottweese.bsky.social · 02/10/2026
www.wormsandgermsblog.com/2026/10/arti...
wormsandgermsblog.com
Vaccination scenarios part 4: initial booster dosing intervals
This is maybe better presented as Part 2b, since I covered the ‘minimum interval’ (or lack thereof) in Part 2. That dealt with the question about whether
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Scott Weese @scottweese.bsky.social · 02/10/2026
Part 4 of our vaccination series: timing of boosters of the same vaccine. Booster is too late: who cares...just give it Too early: there may be some issues if <7 day interval leading to suboptimal longterm responses. Full story in the blog post below. 1/2
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Scott Weese @scottweese.bsky.social · 01/10/2026
Focus on risk assessment, appropriate vaccine selection, close monitoring, and prompt treatment if an adverse event occurs. www.wormsandgermsblog.com/2026/10/arti... 2/2
wormsandgermsblog.com
Vaccination scenarios part 3: premedication
Next in our series, premedication for prevention of vaccine reactions. TLDR: There's no proven premedication strategy that reliably prevents vaccine
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Scott Weese @scottweese.bsky.social · 01/10/2026
Part 3 of our pet vaccination series: premediation to prevent vaccine reactions. Overall message...There's no proven premedication strategy that reliably and safely prevents vaccine adverse events. 1/2
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Scott Weese @scottweese.bsky.social · 30/09/2026
www.wormsandgermsblog.com/2026/09/arti... 5/5
wormsandgermsblog.com
Vaccination scenarios part 2: the “minimum interval”
The scenario. A dog is presented for vaccination, and DAPP (distemper, adenovirus, parvovirus), rabies and leptospirosis vaccines are recommended. After
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Scott Weese @scottweese.bsky.social · 30/09/2026
But it's fair to try to avoid it, to delay a kennel cough vaccine if the risk isn't imminent (and there's a good likelihood the dog will come back), or to give an extra dose later to have more confidence in protection. More details in the blog post linked next. 4/n
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Scott Weese @scottweese.bsky.social · 30/09/2026
We have no idea if it's relevant but there may be theoretical concerns about using live injectable and live nasal/oral vaccines <28d apart. Realistic concern? I don't know. Would I skip important vaccination because of it? No. 3/n
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Scott Weese @scottweese.bsky.social · 30/09/2026
...we don't have different live vaccines that we'd use like that. Short intervals between live-killed or killed-killed vaccines are not an issue. The potential issue? Mucosal (kennel cough vaccines). 2/n
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Scott Weese @scottweese.bsky.social · 30/09/2026
Next in our vaccination scenarios series....the 'minimum interval' in dogs and cats. TLDR? There's no such thing for our injectable vaccines. The only plausible concern is serial administration of different live vaccines and ... 1/n
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Scott Weese @scottweese.bsky.social · 29/09/2026
..unnecessarily strict and consider a 3 yr vaccine to only be effective for 1 yr (since it's typically a 3 yr vaccine as the 2nd dose, a year after the 1st). We're trying to get more flexibility there though. Full thoughts below... 3/3 www.wormsandgermsblog.com/2026/09/arti...
wormsandgermsblog.com
Vaccination scenarios, part 1: Overdue animals
Long post warning.... if you just want the 'what do we do with dogs/cats that are overdue for vaccines", skip to the bolded header below. I’ve been
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Scott Weese @scottweese.bsky.social · 29/09/2026
A single dose will work fine and it's no more off-label than restarting a series, since labels don't say what to do with lapsed animals. Possible exception: rabies vaccine where you're using a 3 year vaccine. The vaccine will work fine, but regulators can be... 2/n
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Scott Weese @scottweese.bsky.social · 29/09/2026
A new series of WormsAndGermsBlog posts about vaccination issues in dogs and cats. Part 1: What do do with an animal that is overdue. TLDR: Just vaccinate. While the approach has often been to 'restart the series' there's no immunological basis for that. 1/n
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Scott Weese @scottweese.bsky.social · 23/09/2026
Cat owners...here's a survey about hairballs and grooming from Dr. Samantha Taylor. Direct link here: www.surveymonkey.com/r/The_Fur_Re... Some more details: www.wormsandgermsblog.com/2026/09/arti...
surveymonkey.com
The Fur Report 2026
Take this survey powered by surveymonkey.com. Create your own surveys for free.
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Scott Weese @scottweese.bsky.social · 10/09/2026
Serial ignoring of FDA requests for recalls. Numerous issues identified with their products and facility. Still no action. Now, they're being sued by the US Justice Department. So, one company shows what should be done. The other deflects and ignores. www.wormsandgermsblog.com/2026/09/arti...
wormsandgermsblog.com
Salmonella contamination of pet products...a tale of two companies
Two unrelated Salmonella contamination issues related to pets have been in the news lately. I’ll start with the most recent one, a recall of Fi pet
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Scott Weese @scottweese.bsky.social · 10/09/2026
Pathogen contamination of pet products...a tale of two companies. Company 1: Contaminated ingredient is detected. Company notified FDA and recalls it. Company 2: Darwin's Pet Food..serial issues with contaminated raw diets that have caused disease in pets and people.
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Scott Weese @scottweese.bsky.social · 02/09/2026
A study of complications after balloon dilatation in dogs with pulmonary stenosis provides good food-for-thought. 3/3 www.wormsandgermsblog.com/2026/09/arti...
wormsandgermsblog.com
Surgeries, antibiotics and infections in dogs and cats: some math
Antibiotics get used a lot in dogs and cats (and other species) that undergo surgery. A lot of the time, it’s unnecessary. Often, I suspect people know
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Scott Weese @scottweese.bsky.social · 02/09/2026
It's more than just rates and P values (which can be misleading as much as helpful with small studies). Yet, small studies can provide useful info for meta-analysis and for context. 2/3
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Scott Weese @scottweese.bsky.social · 02/09/2026
Surgical site infections in dogs/cats. Making guidelines is a challenge since data are limited Infection rate, absolute risk reduction, number needed to treat, and balance of harms and benefits Important concepts but ones we often don't talk about in veterinary medicine 1/n
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Scott Weese @scottweese.bsky.social · 27/08/2026
Hopefully voters will think someone that represents groups that spout anti-LGBTQ+ and Muslim hate, and that make crazy accusations like "You can pick our supposed public health minister who, on her agenda is, I believe, is the slaughter of five to 11 year olds in our town" isn't worthy of a vote 3/3
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Scott Weese @scottweese.bsky.social · 27/08/2026
In it, she's counselling people to use fake legal documents (and making crazy accusations). She is/was a local spokesperson for an anti-(lots of things) group Do we want ppl like this in charge of education? We have to stop enabling hate and harassers. 2/3 guelphpolitico.ca/2022/01/23/b...
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Scott Weese @scottweese.bsky.social · 27/08/2026
Interestingly, one of the people that keeps sending me harassing notices (Valerie Fayer) is running for Wellington Catholic School Board (presumably focused on anti-LBGTQ and related issues.) An article below shows more interesting info... 1/3
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Scott Weese @scottweese.bsky.social · 14/08/2026
But, it's worth investigating. Despite social media hype, the preprint doesn't tell us it's a new threat. It shows us something we need to investigate further. More details below... www.wormsandgermsblog.com/2026/08/arti... 2/2
wormsandgermsblog.com
Amdoparvovirus in dogs: emerging issue or not?
These days, it’s really easy to identify new viruses. The technology has advanced so much you can take a sample from an animal, person or environment, and
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Scott Weese @scottweese.bsky.social · 14/08/2026
www.wormsandgermsblog.com/2026/08/arti...
wormsandgermsblog.com
Amdoparvovirus in dogs: emerging issue or not?
These days, it’s really easy to identify new viruses. The technology has advanced so much you can take a sample from an animal, person or environment, and
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Scott Weese @scottweese.bsky.social · 11/08/2026
Over 90% of the mail that comes to me at @uofguelph.bsky.social is from anti-vaxxers. They're a persistent lot. Here's todays sampling showing the millions they think I owe them for not stopping all vaccination of people in Canada.
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Scott Weese @scottweese.bsky.social · 11/08/2026
Here are more thoughts about approaches to Borrelia seropositive dogs . www.wormsandgermsblog.com/2026/08/arti...
wormsandgermsblog.com
“Lyme disease test” vs “tick exposure test”: the role of routine Borrelia serological testing in dogs.
I get a lot of questions asking what to do when a healthy dog tests positive for Borrelia burgdorferi antibodies (Borrelia burgdorferi being the bacterium
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Scott Weese @scottweese.bsky.social · 11/08/2026
There's no evidence that a positive result in a healthy dog has any clinical relevance. Yet, massive numbers of dogs get treatment or extra testing, chasing a test result, not a disease. The issue isn't the test, it's how we interpret the results. 2/n
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Scott Weese @scottweese.bsky.social · 11/08/2026
"Lyme disease" testing in healthy dogs....does it do more harm than good? Probably, based on how we interpret the results. It's not "Lyme disease" testing, it's testing for antibodies against Borrelia and would best be positioned as a 'tick exposure test'. 1/n
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Scott Weese @scottweese.bsky.social · 29/07/2026
Are there any risks to/from pets with the ongoing Cyclospora outbreak in people? TLDR: No. Full explanation: www.wormsandgermsblog.com/2026/07/arti...
wormsandgermsblog.com
Ongoing Cyclospora outbreak in humans: are there any dog/cat issues to consider?
Cyclospora has been in the news a lot lately because of a large, ongoing outbreak in the US. Total case counts aren’t clear (and official numbers are
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Scott Weese @scottweese.bsky.social · 08/07/2026
Quick update on Rocky Mountain Spotted Fever in dogs in Ontario. www.wormsandgermsblog.com/2026/07/arti...
wormsandgermsblog.com
Rocky Mountain Spotted Fever update, Ontario, 2026
Last year around this time I had a lot of posts about Rocky Mountain Spotted Fever (RMSF) in dogs (and people) in Ontario. Prior to last summer, we didn’t
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Scott Weese @scottweese.bsky.social · 02/07/2026
www.wormsandgermsblog.com/2026/07/arti...
wormsandgermsblog.com
Ethics of Brucella canis treatment in dogs
This one’s going to be long since it’s a complicated area and there are a lot of important issues to discuss. TLDR: I’m not a fan of ‘thou shalt euthanize
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Scott Weese @scottweese.bsky.social · 02/07/2026
The ethics of treating (vs euthanizing) Brucella canis infection in dogs TLDR I’m not a fan of ‘thou shalt euthanize or lock the dog”. I want to prevent disease but I also want to make sure we’re considering the bigger picture and putting things into proper context Full story👇
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Scott Weese @scottweese.bsky.social · 11/06/2026
Update...nitenpyram has now also been given Emergency Use Approval in the US for dogs and cats over 2 pounds and 4 weeks of age.
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Scott Weese @scottweese.bsky.social · 10/06/2026
Those include some with Conditional or Emergency Use Authorization in the US, and others that we have some data to suggest they are also effective. A more complete breakdown can be found here: www.wormsandgermsblog.com/2026/06/arti... 2/2
wormsandgermsblog.com
New World Screwworm prevention and treatment options in dogs and cats
While completely expected given the steady march of New World screwworm (NWS) from Central America into Texas, the recent finding of an infected dog in
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Scott Weese @scottweese.bsky.social · 10/06/2026
With the (unsurprising) finding of New World screwworm in a dog in New Mexico, there's more attention being paid to antiparasitic drug options for dogs/cats. Good news: we have a variety of products. 1/n
wormsandgermsblog.com
New World Screwworm prevention and treatment options in dogs and cats
While completely expected given the steady march of New World screwworm (NWS) from Central America into Texas, the recent finding of an infected dog in
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Scott Weese @scottweese.bsky.social · 08/06/2026
Dentistry is a prime target for veterinary antimicrobial stewardship programs since we know antimicrobial prophylaxis is abundant and overused (and often excessive in terms of drugs and duration). www.wormsandgermsblog.com/2026/06/arti... 2/2
wormsandgermsblog.com
Antimicrobials for veterinary dentistry
Like a lot (or most) things we do with antibiotics in dogs and cats, data are sparse for antibiotic prophylaxis and dental procedures. We know that
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Scott Weese @scottweese.bsky.social · 08/06/2026
rophylaxis for veterinary (dog/cat) dentistry. TLDR: There's very little data. Very low certainty evidence but nothing supports a need for antimicrobial prophylaxis for routine veterinary dentistry. 1/2
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Scott Weese @scottweese.bsky.social · 05/06/2026
New mosquitoes are created but they have shorter lifespans and reduced pathogen transmission risk. So adding millions of infected males (that don't feed off blood) to the mix reduces mosquito #s and disease risks. Elegant harnessing of Mother Nature www.wormsandgermsblog.com/2026/06/arti... 2/2
wormsandgermsblog.com
Releasing mosquitoes to reduce disease? Yes, there's method to that madness
Google’s parent Alphabet has attracted attention through a plan to release up to 32 million mosquitoes in Florida and California. No, it’s not part of a
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Scott Weese @scottweese.bsky.social · 05/06/2026
Why release millions of mosquitoes to reduce mosquito-borne disease? Biology. Google is proposing to release millions of Wolbachia infected male mosquitoes. When those mate with uninfected females, no viable offspring result. If they mate with an infected female... 1/n
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Scott Weese @scottweese.bsky.social · 26/05/2026
Raw pet food associated Listeria outbreak. Contaminated food ✔️ FDA recall request ✔️ Company ignores request✔️ More animals get sick ✔️ Company (5 months later) issues a recall ✔️ Unfortunately, this is not unique or surprising when it comes to raw pet diets www.wormsandgermsblog.com/2026/05/arti...
wormsandgermsblog.com
Raw pet food recall for Listeria (after months of ignoring an FDA recall request and more sick dogs)
I wasn't very quick to write about this because while some incidents of contamination of raw pet food prompt recalls, it's a largely expected event that
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Scott Weese @scottweese.bsky.social · 20/05/2026
Still, some common sense practices to reduce exposure make sense. Largely, it's taking guidance to prevent you from getting infected and applying it to your pets. More thoughts here: www.wormsandgermsblog.com/2026/05/arti... 3/3
wormsandgermsblog.com
Hantavirus: do you have to be concerned about your dogs and cats?
I’ve seen quite a bit of ‘can your dog or cat get hantavirus’ discussion in media lately. Fortunately, unlike with many other emerging infectious
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Scott Weese @scottweese.bsky.social · 20/05/2026
I'm not convinced we know for sure and we could easily miss rare cases since we don't test. However, it's not a major cause of disease, if it causes disease at all. Transmission risks should be near negligible. It's really rare in ppl and people are likely better hosts. 2/n
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Scott Weese @scottweese.bsky.social · 20/05/2026
Should you be worried about your dog/cat getting hantavirus? Should you be worried about getting hantavirus from your dog/cat? TLDR: Infection of dogs/cats is uncommon but happens in areas where hantaviruses are present. Whether it causes disease is still unclear. 1/n
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