Before bloodwork or anesthesia, the safest default is to give nothing by mouth during the fast your clinic sets, including powders and chews. Beyond that, the products most often paused are high-dose fish oil, some herbal blends, and anything new. Your vet decides the details, so send a written list of everything your dog takes before the appointment.
Why fasting includes supplements
Clinics ask for fasting before anesthesia because food in the stomach raises the risk of vomiting and inhaling stomach contents while the dog is sedated. Before many blood tests, fasting also matters because a recent meal can cloud the blood sample with fat, a change called lipemia, which can interfere with some lab measurements.
A supplement sprinkled on a small amount of food is still food. A soft chew is a treat. A spoonful of pumpkin powder mixed with water is a meal as far as the stomach is concerned. When the clinic says no food after a certain time, that includes all of these unless your vet tells you otherwise.
Water is usually allowed until a set time, often the morning of the procedure, but rules vary by clinic and by procedure. Some clinics prefer that small dogs, very young animals, or diabetic patients have a shorter fast, so always follow the specific instructions you were given rather than a general rule.
Medications are different. Many dogs should still receive certain prescribed medications on the morning of a procedure, sometimes with a tiny amount of food. Ask specifically which medications to give and which to hold.
The American Kennel Club's guide on how to prepare your dog for surgery covers fasting, what to bring, and what to expect afterward.
Categories your vet may ask about
Different supplement categories raise different questions. The table below is a conversation guide, not a stop list.
Some supplements can also affect specific lab values. If your dog is having blood drawn for a particular test, such as a thyroid panel or a liver workup, the vet may want certain products held for a few days beforehand so the result reflects your dog rather than the supplement.
Building the list for the clinic
The most helpful thing you can do is send a clear, complete list a few days before the appointment. Include:
- Each product's name and brand.
- The active ingredients, copied from the label or attached as a photo.
- The amount and how often you give it.
- The time of day you usually give it.
- When your dog started it.
Do not forget the products that do not feel like supplements: dental water additives, flavored chews given for joints or calming, fish oil pumped onto food, and anything a family member or dog walker gives. Those are easy to leave off a list and are exactly the kind of detail a clinic wants to know.
Keep the list on your phone and update it whenever something changes. It is useful at every visit, not just before surgery, and it saves time in an emergency when you might not remember exact products.
Check with your vet before stopping any prescribed medication or any supplement your vet specifically recommended, because stopping some products abruptly is not always appropriate.
If you are unsure whether something counts, ask. A quick phone call the day before is easier than a postponed procedure because a dog was given breakfast with a powder on top.
Restarting after the procedure
Once your dog is home and eating normally, supplements can usually restart. A few practical tips:
- Restart one product at a time, a day or two apart, so you can see which one causes any stomach upset.
- Start at the low end of the label amount for the first few days.
- Give supplements with meals rather than on an empty stomach.
- If your dog is on new pain medication or antibiotics, ask whether any supplement should wait until the course is finished.
For bloodwork alone, restarting is often as simple as giving the usual morning routine once the sample is taken. Ask the technician before you leave.
Dogs who have a lot of procedures, such as seniors with regular dental cleanings or dogs being monitored for a chronic condition, benefit from a standing plan. Ask your vet once which products should pause and for how long, write it at the top of your list, and you will not need to work it out again each time.
A note on product choice
The Super Snouts product collection includes powders, chews, and bars across digestion, joint, urinary, cognitive, and allergy categories, each with its ingredient panel on the product page. Whatever brands you use, keep the labels or photos handy, because the clinic needs ingredients rather than product names. If your dog takes several products from different brands, look for overlapping ingredients, such as two products that both contain fish oil or mushrooms, and point them out on the list.
Questions about pausing supplements
Can my dog have supplements the morning of bloodwork?
Usually not if the test requires fasting, because supplements given with food break the fast. Ask your clinic what the test requires.
Does fish oil need to stop before surgery?
Some vets pause high-dose fish oil before surgery and others do not. Your surgeon will decide based on the dose and the procedure.
What about probiotics?
Probiotics are generally low concern but still count as food during a fast. Restart them with the first meal after the procedure unless told otherwise.
How far ahead should I send my supplement list?
A few days before is ideal, so the vet has time to review it and call you if anything should change. Bring a printed copy on the day as well.
My dog only takes a pumpkin powder. Does that matter?
It counts as food, so it falls under the fasting rules. Outside of the fast, it rarely raises any other concern.
Related reading: Post-Surgery Gut Recovery in Dogs; Dog Supplement Interactions With Medications: What to Ask Your Vet