Six stool changes that mean call the vet.

There's a reason vet techs ask about your dog's poop first. It's an honest readout of what's happening internally: digestion, hydration, parasites, stress, dietary intolerance, organ function. Most of it shows up in the yard before it shows up at the clinic. Our team trains to notice. Here's what we're looking for, in six categories.

None of this is a diagnosis. It's a prompt: when you see one of these, call your vet. Catching things early is the whole job.

Visual reference

A field guide for the yard.

Bookmark this page on your phone. When you spot something that looks off, pull it up and compare, then share with your vet.

BaselineHealthy stool

Sign 01Color change

Sign 02Consistency change

Sign 03Blood or tar

Sign 04Mucus / coating

Sign 05Worms / parasites

Sign 06Foreign object

EmergencyStrawberry jam stool

FirstWhat healthy looks like

Before naming the warning signs, name the baseline. The American Animal Hospital Association uses a 1 to 7 fecal scoring scale where 1 is hard pellets and 7 is fully liquid. Ideal sits at about a 2 or 3:

• Color: chocolate brown, consistent throughout.
• Shape: log-like with visible segmentation.
• Texture: firm enough to hold its shape, soft enough to dent under a pickup bag.
• Frequency: one to three times per day, predictable.
• Smell: present, but not eye-watering or unusually sweet/sour.

Deviation from any of these, for more than a day or two, is information worth acting on.

Sign 01Color changes

The color of stool is one of the loudest, most visible signals. Six colors come up most often:

One off-color stool isn't a crisis. The same off color, twice in a row, is.

Sign 02Consistency changes

Stool consistency reflects how fast food moved through the gut and how much water was reabsorbed. The two ends of trouble:

Diarrhea

Defined as liquid or near-liquid stool. One bout is often dietary indiscretion: a stolen snack, a new treat. More than 24 hours of diarrhea, or any diarrhea in a puppy or senior, warrants a call. Watery diarrhea risks rapid dehydration; bloody or mucus-streaked diarrhea is more urgent.

Constipation

Hard, dry, pebble-like stool. Straining without producing. Less talked about, equally meaningful. Can signal dehydration, dietary fiber issues, prostate enlargement, or anal-gland trouble. Acceptable for a day. Beyond that, vet call.

Sign 03Blood or tar-like stool

Both red blood and black tarry stool are signals to act on the same day. The color tells you roughly where the bleeding is happening:

• Bright red blood on the surface or coating: lower GI (colon, rectum, anal area). Often colitis, anal gland issues, or parasites.
• Dark red blood mixed throughout: middle GI tract.
• Black, tar-like stool (melena): digested blood from the stomach or upper small intestine. This is the most concerning. Often points to an ulcer, foreign object, or serious upper-GI bleed.

Don't wait this one out. Take a photo, bag a sample if you can, and call the clinic.

An emergency patternStrawberry jam stool

One blood-related appearance is distinctive enough that veterinarians have a nickname for it: strawberry jam stool (sometimes called raspberry jam stool). The color and texture genuinely resemble jam: bright raspberry-red, glossy, gelatinous, often almost entirely liquid. If you see it in your yard, this isn't a "call within 24 hours" situation. It's an emergency-clinic visit, today, immediately.

What it looks like

• Color: bright raspberry-red to deep red, often glossy.
• Texture: jelly-like and gelatinous, closer to liquid than to solid stool with blood on top.
• Smell: distinctively foul, sometimes described as metallic or rotten.
• Onset: sudden. Your dog was almost certainly fine yesterday.
• Often paired with: repeated vomiting, lethargy, hunched posture, refusal to eat or drink.

What it usually means

AHDS is most commonly linked to a sudden overgrowth of Clostridium perfringens in the gut, which damages the intestinal lining and lets fluid and blood leak into the bowel. Triggers can include a sudden diet change, scavenging, stress, or sometimes no identifiable cause at all. It is not contagious between pets the way parvovirus is. But because parvo can look very similar in its early hours, the clinic will often test for both.

Dogs at higher risk

• Small breeds. Yorkies, Maltese, Miniature Schnauzers, Toy Poodles, Cavaliers.
• Middle-aged dogs. Most reported cases are between two and eight years old.
• Dogs with a history of dietary indiscretion. Counter-surfers, garbage-eaters, scavengers on walks.
• Recently stressed dogs. After boarding, travel, a move, a new household member.

What to do, right now

1. Don't try to feed or water. Both can worsen vomiting and delay treatment.
2. Photograph the stool next to a familiar object for scale. Bring the photo.
3. Bag a sample if you can do it quickly. Useful for in-clinic diagnostics.
4. Go to the emergency clinic. Call ahead so they can be ready for IV fluids on arrival. Don't wait for your regular vet to open.

The good news: when AHDS is caught early and treated aggressively with IV fluids, most dogs recover within 24 to 48 hours and go home the next day. The thing that determines outcome is almost always how quickly the dog gets fluids, not the severity of the bleeding itself.

Sign 04Mucus or jelly-like coating

Mucus is the colon's natural lining. A small amount is normal and even healthy. What's not normal: large amounts of clear or yellowish jelly-like coating, or mucus that persists across multiple stools.

Common causes:

• Colitis. Inflammation of the colon, often from food sensitivity or stress.
• Parasites. Giardia, whipworm, and coccidia all commonly cause mucus.
• Acute stress. A recent move, a kennel stay, a new pet in the house.
• Inflammatory bowel disease. Chronic, recurring mucus is worth a workup.

One mucusy stool? Note it. Three in a row? Call.

Sign 05Visible contents & parasites

Sometimes the issue is what's in the stool. The things we look for, in order of urgency:

Worms or worm segments

Roundworms look like cooked spaghetti. Tapeworm segments look like small grains of rice, sometimes still wriggling. Either is a same-week vet call for deworming. Highly treatable, but contagious to other pets and (with some species) to humans.

Undigested food

Occasional bits of corn or carrot are normal. Large pieces of kibble passing through whole means food isn't being absorbed properly. Points to fast transit time or pancreatic insufficiency.

White flecks that move

That's tapeworm. The white flecks are the segments; they sometimes move briefly after passing. Schedule a vet appointment promptly.

Sign 06Foreign objects

This one earns its own category because the stakes are different. When something appears in your dog's stool that didn't come from a meal, it tells you two things at once: your dog ate something they shouldn't have, and more of it may still be inside them. Foreign-body obstructions are one of the most common emergency surgeries in veterinary medicine, and one of the most preventable.

What to watch for

• String, ribbon, dental floss, or hair ties. Especially dangerous. Linear foreign bodies can saw through intestinal walls. Never pull a string out of either end of your dog. Take them straight to the clinic.
• Fabric, sock fragments, or stuffing. Sign your dog has been chewing on something they shouldn't. Check the house for the source.
• Plastic or rubber pieces. Bits of toys, chewed-up balls, baby bottle nipples. Bring the sample and any matching item to the vet.
• Wood splinters or mulch. Common after off-leash time. Usually passes, but jagged pieces can cause internal damage.
• Coins, batteries, or metal. Same-day vet call. Some metals (zinc, lead) are toxic; batteries can cause chemical burns.
• Rocks or gravel. Often indicates a behavioral issue (pica) worth discussing with your vet.

What to do if you find one

1. Bag the sample in a sealed plastic bag with a note (date, dog name).
2. Photograph the object next to a coin or ruler for scale.
3. Look for the source in the house: a chewed-up toy, missing sock, etc.
4. Call the vet. Even if your dog seems fine, they may want X-rays to confirm nothing else is lodged.