| Verdict for dogs | Caution |
| Severity | 2 / 5 — Mild — usually stomach upset; watch them. |
| Safe amount | A taste at most |
| Category | Dairy |
| Source | ASPCA Animal Poison Control — People Foods to Avoid Feeding Your Pets · reviewed 2026-08-07 · confidence: high |
Pets do not carry much lactase, the enzyme that breaks down the lactose in milk, so milk and dairy commonly cause diarrhea and other digestive upset. It is not poisonous — it is just a reliable route to a mess and a sore stomach.
Don't make it a habit. Watch for vomiting, diarrhea or a lost appetite over the next day and call your vet if it doesn't settle or your dog seems unwell.
Never induce vomiting and never give any medicine unless a vet tells you to — it can do more damage than the poison. What we will and won't tell you.
If you're sharing food because you want to treat them, a treat formulated for dogs does the job without the guesswork.
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Can cats eat milk? — Feed with caution to cats.
Not toxic, but be careful — milk isn't poisonous to dogs, and it comes with caveats that matter. Pets do not carry much lactase, the enzyme that breaks down the lactose in milk, so milk and dairy commonly cause diarrhea and other digestive upset. It is not poisonous — it is just a reliable route to a mess and a sore stomach.
Watch for: Vomiting; Diarrhea or loose stools; Loss of appetite; Belly discomfort or unusual tiredness. Some signs lag by a day — call, don't wait.
The safe amount is a taste at most, as an occasional treat rather than a daily habit. Large amounts mainly cause stomach upset; if that doesn't settle within a day, call your vet.