How to Collect a Stool Sample for Your Veterinarian
When your veterinarian asks you to bring a stool sample, you may have questions right away: How much do they need? How fresh should it be? Can it contain litter? And—perhaps most importantly—what should you put it in?
Collecting a useful sample is simple once you know what to do.
Why Does Your Veterinarian Need a Stool Sample?
Fecal testing can help veterinarians look for intestinal parasites and investigate diarrhea, blood, mucus, digestive problems, or other gastrointestinal symptoms.
Depending on your pet’s history and symptoms, testing may look for:
- Roundworms
- Hookworms
- Whipworms
- Tapeworms
- Giardia
- Coccidia
- Evidence of bleeding or inflammation
- Selected bacterial, viral, or other infectious causes
Some pets with intestinal parasites have no visible symptoms. Routine fecal testing can therefore be valuable even when stool looks completely normal.
First, Ask Whether Special Instructions Apply
Most routine samples can be collected at home, but the ideal handling method varies by test.
If your veterinarian has requested a specific study, ask:
- How much stool is needed?
- How fresh must it be?
- Should it be refrigerated?
- Does the clinic provide a collection container?
- Do you need samples from more than one day?
- Should any visible worms or foreign material be included?
Some tests require an especially fresh, unrefrigerated sample. Follow the veterinary team’s instructions rather than relying on a universal rule.
How Much Stool Should You Collect?
For most routine fecal examinations, a walnut-sized portion—approximately one to two teaspoons—is generally sufficient.
Very soft or liquid stool may require a larger sample. You don’t need to bring the entire bowel movement unless your veterinary team asks you to.
When in doubt, collect slightly more rather than a tiny smear.
Use a Clean, Dry, Leakproof Container
Good options include:
- A container supplied by your veterinary hospital
- A clean disposable plastic container with a tight lid
- A sealed specimen cup
- A resealable plastic bag placed inside a second bag
Do not reuse a food container that you intend to keep.
The container should be clean and dry, but it usually does not need to be sterile unless the clinic gives you specific instructions.
How to Collect a Dog’s Stool Sample
The easiest time is immediately after your dog defecates.
- Bring your container, bag, or disposable collection tool on the walk.
- Allow your dog to finish.
- Use a clean disposable spoon, tongue depressor, or inverted plastic bag to collect a portion.
- Choose material that has had the least contact with soil, grass, gravel, or chemicals.
- Seal the container promptly.
- Wash your hands thoroughly.
If stool is liquid, scoop as much as possible into a leakproof container. Do not absorb it with a paper towel because the paper can interfere with handling and testing.
How to Collect a Cat’s Stool Sample
For a cat, timing and litter management help reduce contamination.
Possible approaches include:
- Scoop a fresh bowel movement from the top of the litter before it becomes heavily coated.
- Temporarily provide a thoroughly cleaned, dry box.
- Ask your veterinarian whether a small amount of nonabsorbent collection litter is appropriate.
- Use a clean disposable utensil to transfer the sample into the container.
Do not leave a cat without access to an acceptable litter box simply to obtain a sample. Stress and litter-box avoidance can create additional problems.
In a multi-cat household, temporarily separating the cat with their own clean box may help identify whose stool you are collecting. Make sure the cat has food, water, a resting place, and adequate space during the brief separation.
The Fresher, the Better
Whenever possible, collect the sample on the same day as the appointment and deliver it promptly.
Old stool from the yard or a litter box may dry out, become contaminated, or no longer provide the best material for testing. Freshness can be particularly important for detecting certain organisms.
If you cannot deliver the sample within a few hours, contact the clinic for storage instructions.
Should You Refrigerate It?
For many routine fecal tests, you can temporarily refrigerate a sealed sample if you can’t deliver it immediately. Do not freeze it.
Because feces can contain bacteria and parasites capable of contaminating food or surfaces:
- Use a tightly sealed container.
- Double-bag it.
- Keep it completely separate from human food.
- Disinfect any contaminated surfaces.
- Deliver it as soon as possible.
Some tests call for a very fresh, unrefrigerated sample, so confirm instructions with your veterinary team.
Label the Sample
Write down:
- Your name
- Your pet’s name
- The date
- The collection time
- Which pet produced it, if you have more than one
- Any relevant observation, such as visible blood, mucus, worms, or foreign material
A photograph taken before collection can also help document color, quantity, and appearance.
Try to Avoid Contamination
A small amount of grass or litter is often unavoidable, but excessive contamination can reduce a sample’s usefulness.
Avoid collecting stool that has been:
- Sitting outdoors for an extended period
- Mixed with soil or standing water
- Exposed to lawn chemicals
- Heavily coated in cat litter
- Taken from a communal area when the animal is unknown
- Frozen
- Stored in an unsealed container
Never handle feces with bare hands. Wash thoroughly afterward, even if you wore gloves or used a bag.
What If You See a Worm?
If you see a worm or rice-like segment:
- Take a clear photograph.
- Place it in a secure container if your veterinarian requests it.
- Bring a separate fresh stool sample as well.
- Prevent children and other pets from contacting the area.
- Wash your hands thoroughly.
Do not assume that one visible worm identifies every parasite your pet may have. Proper testing is still important.
What If You Cannot Get a Sample?
Tell the veterinary team. Do not delay urgent care because your pet has not produced stool.
The clinic may be able to collect a small sample during the examination, provide a container for later drop-off, or recommend another diagnostic approach.
If your pet has diarrhea, vomiting, blood in the stool, loss of appetite, pain, weakness, or other signs of illness, the examination matters more than arriving with a perfect sample. Prepare in advance for what you’ll need at the emergency veterinarian so you can leave quickly.
A Small Sample Can Provide Valuable Information
A fresh, properly handled stool sample can save time and help your veterinary team get more useful diagnostic information.
If your pet is experiencing severe or repeated diarrhea, black stool, substantial bleeding, vomiting, weakness, abdominal pain, or rapid deterioration, seek veterinary guidance promptly. Oakland Veterinary Referral Services provides emergency and critical care 24 hours a day at (248) 334-6877.