Signs of Poisoning in Dogs: The Complete Symptom Guide

Why there is no single poisoned look

Symptoms track the toxin, not the fact of poisoning. A mouth-irritant plant announces itself in seconds; a drug that scrambles the nervous system shows up in an hour; a substance that injures the kidneys or liver can show nothing for a day or more, then arrive all at once. So the useful question is never just does my dog look sick. It is what did my dog eat, how much, and when, because that is what a poison-control specialist triages on. Our guide to how long poisoning symptoms take walks the timeline toxin by toxin.

Read the groups below as a map of what to watch for, not a diagnosis. Any one sign can have a dozen harmless explanations, and the combination plus the history is what matters. If you already know your dog got into something, the symptom list is secondary: make the call described at the bottom of this page first.

Gastrointestinal signs

The most common and least specific group. Vomiting, diarrhea, drooling, and a sudden refusal to eat cover everything from a mild dietary upset to the first hour of a serious poisoning, which is exactly why they cannot be read in isolation.

• Vomiting and lethargy together: covered in depth in vomiting and acting tired.
• Diarrhea soon after eating something new or scavenged: see diarrhea after eating something.
• Heavy drooling or foaming, often the first sign of an oral irritant or a nausea-inducing toxin: see drooling and foaming.
• Refusing food after a trash raid, a classic early flag: see will not eat after the trash and our dog got into the trash guide.

Neurological signs

When a toxin reaches the nervous system the signs are frightening and they escalate fast, which moves them up the urgency ladder. Trembling, twitching, stumbling, a drunk-looking gait, unusual agitation, or a seizure all belong here.

• Tremors or shaking: see tremors and shaking.
• A wobbly, uncoordinated, drunk-looking walk: see acting drunk and wobbly.
• Any seizure is an emergency in its own right: see seizures and poisoning.
• Sudden agitation, restlessness, or a dog who cannot settle can precede tremors with stimulant toxins like caffeine and chocolate.

Cardiovascular, respiratory, and gum-colour signs

Some toxins act on the heart, the blood, or the ability to carry oxygen, and the tell is often in the gums. Healthy gums are pink and moist. Pale, white, blue-grey, brick-red, or yellow gums are all abnormal and all reasons to move quickly, as are a racing or irregular heartbeat and laboured breathing.

• Pale or off-colour gums, a key sign with onion and garlic damage and with internal bleeding from rodenticides: see pale gums.
• A pounding or racing heart, common with chocolate and caffeine.

Urinary and whole-body signs

The slowest and most easily missed group, because these signs mean an organ is already under strain. Dramatic changes in thirst or urination, yellowing of the gums or eyes, or a dog who is simply not themselves for no clear reason all deserve attention.

• A sudden jump in drinking and urinating: see drinking lots of water.
• Reduced or absent urination is a red flag for kidney injury from grapes and raisins and antifreeze.
• Vague off behaviour with no obvious cause is worth taking seriously: see eating but acting weird.

The delayed-onset toxins that make waiting dangerous

A handful of the worst poisonings share one cruel feature: the dog looks fine for hours to days while damage builds, sometimes with a false recovery in between. With these, waiting for symptoms is waiting too long.

• Xylitol: blood sugar can crash within an hour; liver injury can follow.
• Grapes and raisins: acute kidney injury, an emergency at any amount.
• Antifreeze: a deceptively drunk phase, then kidney failure.
• Onion and garlic: red-blood-cell damage that can take days to show.
• Rodent poison: internal bleeding three to five days later.
• Acetaminophen: liver injury and blood changes with a delay.

What to tell the vet

Four facts change the plan more than anything you will say: the substance (bring the packaging), the amount (count what is left and subtract), the timing (when you last know your dog had not eaten it), and your dog's weight. Our first 10 minutes guide is built entirely around gathering these and making the call in order.

Red-flag combinations: go now, do not wait to call