food
Milk
NOT RECOMMENDED
Milk is not toxic, but most adult dogs struggle to digest it and it often causes wind, loose stools or vomiting.
What to do
Stop offering milk and give fresh water. Mild wind or loose stools usually settle within a day.
When to contact a vet: Contact your vet if diarrhoea or vomiting lasts more than 24 hours, if your dog is a young puppy, or if there is a painful belly, repeated vomiting or unusual lethargy after a fatty or milky meal. Chocolate milk is a separate concern and needs urgent advice.
Symptoms to look for
- wind
- stomach gurgling
- loose stools or diarrhoea
- vomiting
- abdominal discomfort
Why
Cow's milk is not poisonous to dogs, but puppies stop producing much lactase after weaning, so most adult dogs cannot digest the lactose in milk properly. The usual result is wind, stomach gurgling, loose stools or vomiting a few hours later. Whole milk is also high in fat, so repeated or large servings can contribute to weight gain and, in susceptible dogs, pancreatitis. Milk is not a substitute for water, and puppy milk replacer, not cow's milk, should be used for orphaned puppies. A lick from a spoon is unlikely to cause harm in a dog that tolerates dairy, but there is no nutritional reason to offer it.
- Substances of concern
- lactose, milk fat
- Safer parts
- A small lick or splash in dogs that are known to tolerate dairy.
- Parts to avoid
- Bowls of milk, cream, milkshakes, flavoured or chocolate milk, and milk for puppies in place of proper milk replacer.
- Preparation
- If you offer any, keep it to a teaspoon of plain milk. Fresh water should always be available instead.
- How much matters
- No routine serving. Occasional tiny amounts at most, and none at all in dogs with a sensitive stomach or a history of pancreatitis.
- Severity
- Low
Sources
- PDSAVeterinary organisation — Nutrition
- American Kennel ClubVeterinary information — Digestive effects
Information reviewed against recognised veterinary and animal-safety sources. Source organisations are independent of Is It For Dogs unless otherwise stated.
Last reviewed 6 September 2026 · next review due September 2027.
Safety classifications are based on available expert and veterinary information. Individual dogs may react differently, particularly dogs with allergies, existing health conditions or specific dietary requirements.
Important: Is It For Dogs provides general information about the safety of foods, plants, drinks, ingredients and other items around dogs. Our information is based on sources we consider reliable and is intended to help dog owners make informed decisions. It is not a substitute for advice from a qualified veterinary professional. Read more
Dogs can react differently depending on their size, age, health, allergies, medications, the amount consumed and other circumstances. An item classified as Safe is not necessarily suitable for every individual dog.
If your dog has eaten something potentially poisonous or dangerous, has eaten an unknown substance, or is showing concerning symptoms, contact your veterinarian or an emergency veterinary service immediately.
Do not induce vomiting or give your dog medication unless specifically instructed to do so by a veterinary professional.