Home-care guide · Dog and cat

Collecting a stool sample, right the first time

Your veterinarian asked for a fecal sample. Two things matter for a reliable result: that it is fresh and that it is clean. Here is how to collect it correctly and safely, at home.

This guide supports your veterinarian's advice; it does not replace it. A question about the procedure? Call us at 514 223-1197.

Is your pet unwell? Call before collecting

Call us right away if your pet shows any of these signs:

heavy blood in the stool
black stool
repeated vomiting
lethargy
refusing to eat
a possible swallowed toxin or object

Don't wait to collect a sample first, call us at 514 223-1197.

Understanding the test

Why your veterinarian needs a fecal sample

Microscopic evaluation of a stool sample is a non-invasive test with high diagnostic value. It rapidly identifies the cause of many gastrointestinal disorders.

Intestinal parasites

Gastrointestinal worms, coccidia, giardia: fecal analysis detects these organisms, their eggs, or their cysts in your pet's stool.

Digestive health

When digestive problems persist, the microscopic exam can reveal useful clues to their cause, such as signs of inflammation or the presence of parasites.

Pathogenic bacteria

Some bacteria can cause digestive problems. A fecal exam helps your veterinarian decide on next steps; depending on the situation, dedicated tests (culture, PCR) are sometimes needed to look for them.

A simple but essential test

Fecal analysis is the baseline test for evaluating intestinal symptoms. If results stay negative despite persistent symptoms, your veterinarian may recommend further tests: abdominal ultrasound, blood work, or intestinal biopsy.

The analysis is run at our laboratory Parasite prevention

Materials

Get your materials ready before collection

Having everything ready in advance makes the procedure faster and safer. All items are available at pharmacies.

Disposable latex or nitrile medical gloves

Airtight container: zip-lock bag or small jar with a lid

Single-use plastic spoon

Label or marker to identify the sample

Practical tip

Our clinic can provide a purpose-made collection container, airtight and pre-labeled. Feel free to request one during your next call or visit.

Hygiene and safety

Essential precautions before you start

Animal stool can contain infectious agents transmissible to humans. Strict hygiene is essential throughout the procedure.

Infectious agents of concern

GI worms

Some worms, such as roundworms (Toxocara) and hookworms, are transmissible to humans and can cause infection, especially in children.

Giardia

Intestinal parasite that can be transmitted to humans by the fecal-oral route, that is, when traces of stool reach the mouth via hands or surfaces.

Bacteria

Some stool-borne bacteria (Salmonella, Campylobacter) can cause infections in humans.

Toxoplasmosis (cats)

Only cat stool can carry it, mainly after several days in the litter box; fresh stool is low-risk. Of concern for pregnant women and immunocompromised individuals.

Hygiene rules to follow

Gloves required: wear disposable gloves during collection and any time you handle the sample.
Immediate handwashing: with soap for at least 20 seconds after collection (even if you wore gloves), before touching your face, clothing, or other surfaces.
Single-use materials: never reuse the same spoon or container; clean materials for each collection prevent cross-contamination.
Hold the container open: when inserting the sample, to avoid contaminating the edges or lid.
Keep children away: keep children away during collection and have them wash their hands after any contact with the pet or its environment.
Safe disposal: place the gloves, the spoon, and any leftover stool in a sealed bag in the household trash. Do not compost, and do not flush soiled litter.

At-risk individuals: delegate the collection

Pregnant women and immunocompromised individuals (those with a weakened immune system) should not collect the sample themselves. Ask someone else to do it and make sure they follow the hygiene rules described above. This also applies to routine litter-box cleaning: have someone else do it, or wear gloves and scoop daily so stool is removed before it can become infective.

Preparation

Before you start: a few checks

Good preparation prevents common mistakes and ensures a reliable result.

Veterinarian's instructions: re-read the instructions given during your last call or visit (quantity, timing, special technique).
Labeled container: prepare the container in advance with your pet's name and the collection date.
Normal diet: do not change your pet's food before collection; abnormal stools caused by a dietary change could skew results.
Recent treatments: tell the clinic about any recent dewormer, antiparasitic, laxative, or contrast agent (barium): a recent dewormer can mask parasites and cause a false negative, and barium or a laxative can interfere with the microscopic analysis. Never stop a prescribed product on your own.
Materials at hand: set out gloves, container, and spoon before going outside or approaching the litter box.
Best timing: morning stools are generally the freshest and most representative.

Collection

Technique by species

The method differs slightly between dogs and cats. Follow the steps for your pet.

Collecting from a dog

Outdoors, step by step

Go outside with your dog and your materials

Bring gloves, container, and spoon. It is an unpleasant but quick task: with gloves and a disposable spoon you never touch anything directly. Stay close at the moment of defecation to act quickly: fresh stool gives the best results.

Collect right after defecation

Collect the sample within minutes. The longer you wait, the more the structures the lab needs to identify under the microscope change: motile forms disappear and eggs or oocysts can develop, which complicates analysis.

Sample from the center, away from the ground

Use the spoon to collect from the center of the stool, not the surface touching the ground or the ends. Do not collect a urine-soaked portion: choose a clean, firm part. Quantity: about 1 to 2 g, the size of a grape (half a teaspoon).

Avoid the part touching grass or gravel: risk of environmental contamination.

Transfer to the container and seal

Place the sample in the airtight container and close it immediately. Remove gloves by turning them inside out, without touching the outer surface (so your hands never touch the dirty side), then wash your hands.

Collecting from a cat

At the litter box, step by step

Empty and refill the box with fresh litter

Empty the box completely and fill it with clean litter. Clean litter prevents cross-contamination with old stool, urine, or environmental agents.

Wait for your cat to use the box

Stay nearby to know when defecation occurs. Wait time can range from a few minutes to several hours depending on the cat. You don't have to watch constantly: check the box periodically, or use the plastic-wrap method (step 4) if the wait is long.

Sample from 3 areas of the stool

Using the spoon, collect a small sample from 3 different spots of the same stool: parasites are not spread evenly, so sampling several spots improves the chance of catching them. Collect from the top and center, avoiding clumped litter granules and urine-soaked portions. Total quantity: about 1 to 2 g (the size of a grape). Place the sample in the container, remove your gloves, and wash your hands.

If your cat shares the box, identify the right stool before collecting. Brush off any stuck granules and, ideally, use non-clumping (paper or pellet) litter for a cleaner sample.

Alternative: plastic wrap under the litter

If your cat refuses a clean box, lay plastic wrap across the bottom of the box and place only a few granules of usual litter around the edges, leaving the center bare: the stool will deposit directly on the wrap, where you then collect it. Note that some cats will not accept a near-bare surface.

Covered or self-cleaning litter boxes

If your cat uses a hooded or automatic box, empty it completely and disable the automatic function for the duration of the collection. A temporary open box with clean litter makes access to a fresh sample easier.

After collection

The immediate steps after collecting

Handling and transport matter as much as the collection itself.

Seal and label

Make sure the container is airtight. A tightly sealed container also keeps the sample from drying out, which would damage the fragile parasites we need to identify. Write your pet's name, collection date, and time (and, for a multi-day series, the day number). This information is essential for the laboratory.

Immediate hygiene

Wash your hands thoroughly with soap. Disinfect any surface (table, counter) that may have been in contact with the sample: first wipe away any visible residue, then apply a household disinfectant cleaner.

Refrigerate promptly

Place the sealed container in the refrigerator (between 2 and 8 °C) if you cannot bring it to the clinic within the hour. Slip it into a second bag, away from food. In hot weather, carry it in an insulated bag with an ice pack, and never leave it in a parked car. Never freeze a fecal sample.

Never freeze the sample

Freezing destroys fragile parasites such as giardia and distorts the structures needed for microscopic identification, making the analysis unreliable. Always store the sample in the refrigerator, never in the freezer.

Storage and timing

How long can a sample be kept?

Analysis quality depends directly on sample freshness. The clock starts the moment your pet passes the stool, not when you refrigerate it: collect it without letting it sit on the ground and refrigerate without delay. These timelines apply to eggs, cysts and oocysts, which keep well when chilled; fragile motile forms (such as trophozoites) are only seen on a very fresh sample.

0–2 h

Ideal

Maximum quality. Bring to the clinic as soon as possible.

2–6 h

Acceptable

Refrigerate. The majority of parasites remain detectable.

6–24 h

Borderline

Less reliable results. Some parasites change or degrade. Inform the clinic.

> 24 h

Not viable

Discard in a sealed bag and repeat the procedure. A reliable result is no longer possible.

When the clinic is closed

If you collect the sample outside clinic hours, keep it refrigerated and bring it first thing the next morning. Let us know about the storage delay so our technician is informed.

Multi-pet households

More than one dog or cat at home?

Collecting in a multi-pet household needs a few extra precautions to avoid identification errors.

One container per pet

Never mix stool from two animals, even if only one test was requested. Each analysis must correspond to a specific animal.

Clear labeling

Label each container with the animal's name, date, and time. If in doubt, add a description (e.g., 'Mittens, tabby cat').

Same day if possible

Ideally, collect samples from all your pets on the same day to simplify transport and keep each sample fresh.

Cats in a shared box

If multiple cats share the box, isolate the relevant cat in a separate room with a clean box to be sure you collect the right stool.

FAQ

Your questions, our answers

The most common situations when collecting a fecal sample.

My pet doesn't feel like going: what should I do?

Be patient. Keep your dog on a leash outside in their usual area and wait for them to go naturally. For cats, make sure the clean litter is accessible in a calm area. Avoid stressing the animal, as this can delay defecation. If the collection is urgent, contact us and we will advise you.

Does my pet need to fast before collection?

No. Unlike a blood test, a fecal analysis requires no fasting. Feed your pet normally; withholding food serves no purpose and can delay defecation.

My pet's stool is very soft or liquid: can it still be used?

Yes, soft or diarrheal stool is perfectly analyzable, and often more important to analyze, as it may contain more active parasites or bacteria. Collect what you can with the spoon and bring it in as quickly as possible: for a soft or diarrheal sample, very prompt delivery (ideally within an hour) also lets the lab look for the fragile motile forms of some parasites. If that is not possible, refrigerate and bring it anyway, as the sample remains useful.

Can I use stool that has been sitting in the litter box for several hours?

Ideally no. Stool more than 6 hours old in the litter gives less reliable results. If you have no other option, bring it anyway and tell our team the approximate collection time so the technician can adjust their interpretation.

My vet asked for 3 consecutive-day collections: why?

Some parasites, such as giardia, are shed intermittently; a single sample can give a false negative. Three consecutive collections clearly increase detection sensitivity. For a planned multi-day collection, keep each sample refrigerated and bring them together: this is an exception to the usual freshness window, and our team will tell you how to proceed.

How much stool is needed exactly?

About 1 to 2 grams is plenty, roughly the size of a grape (half a teaspoon); no need to bring more. If you truly have only a tiny amount, bring what you have and let us know: an imperfect sample is usually better than none. When in doubt, our team can give you the exact quantity when you request the test.

My pet defecated but I forgot to prepare the container: what should I do?

Collect the sample anyway with whatever you have on hand: any clean lidded container, but free of soap, household-cleaner, or food residue (rinse with plain water and dry). No gloves? Use a clean plastic bag like a glove: pick up the stool through the bag, then turn it inside out to seal it, without touching the stool with bare hands. Refrigerate it and bring it in, noting the collection time. An imperfect sample is usually better than none at all.

Questions about the collection?

Our team is here to guide you or to provide a suitable collection container.

Book an appointment (opens in a new tab) 514 223-1197