Can Puppies Drink Cow's Milk? No, Use Puppy Formula

Why cow's milk is not right for puppies

A growing puppy has very different needs from a person or a calf. VCA Animal Hospitals explains that a mother dog's milk contains more than twice as much protein as cow's milk, and that cow's milk is also lower in calories and fat and higher in lactose. The AKC adds that cow's milk lacks enough calories, calcium and phosphorus for growing pups, so it is not a suitable substitute.

The lactose matters because many dogs have trouble digesting it. The AKC says many canines are lactose intolerant, and that milk can cause intestinal upset, with diarrhea and loose stools among the signs. In a tiny puppy, diarrhea is more than a mess: it can lead to dehydration and weight loss quickly, which is why it needs a quick call to the vet.

What to feed instead: mother's milk or puppy milk replacer

A nursing puppy should be getting its mother's milk. If the mother is not available, or the puppy is orphaned, a commercial canine milk replacer is the answer. VCA calls a commercial puppy formula superior to cow's milk and homemade mixtures, and the AKC calls it the best replacement milk for puppies. Choose one made for puppies and follow the label.

Mix only one feeding at a time, and warm it to about 100 degrees F, which VCA recommends, because chilled puppies often will not feed well. VCA says to feed every 2 to 4 hours for the first week of life and then every 4 to 6 hours until weaning, but your vet should confirm the plan for your puppy, particularly for an orphan or a very small breed.

When do puppies stop needing milk?

VCA says formula should be the only food until about 3 to 4 weeks of age, when semi-solid food is introduced, with solid food by about 5 to 6 weeks. Moving to solid food is a gradual process, and your vet or the breeder can guide the schedule for your puppy's size and breed.

Once a puppy is on solid food and drinking water, it does not need milk of any kind. Fresh water should be available, and a shallow bowl is easiest for small puppies. Our guide on whether puppies can drink water covers weaning and hydration basics.

What if my puppy already drank cow's milk?

A few laps are unlikely to cause trouble for many puppies, but watch closely, because tiny puppies can go downhill fast. Stop offering milk, keep the puppy warm, and keep the usual food or formula going in the normal amounts. Do not give medicine or home remedies for an upset stomach.

Call your vet if the puppy has diarrhea, vomits, seems bloated, is weak or sleepy, stops feeding, or does not gain weight. VCA notes that puppies should gain weight daily and that weight loss or no gain can signal disease, and AKC says to call the vet if diarrhea continues after you adjust the amount of formula.

Safer ways to use food for puppies

If you want a treat for an older puppy that is eating solid food, use a few pieces of a puppy-appropriate food from your vet's list instead of milk. A slower bowl or a mat helps a puppy that gulps its food, and a slow feeder bowl for puppies spreads a meal out so it is gentler on a young stomach. A small anti-gulp slow feeder bowl or a silicone slow feeder bowl with mat suits most small puppies.

For adult dogs and the full milk picture, see our guide on whether dogs can drink milk. Your vet can recommend the right diet and the right amount for your puppy's age, breed and size, so ask at the next visit.

Signs of trouble and when to call the vet

Call your vet promptly if your puppy has repeated vomiting, diarrhea that continues, a swollen belly, weakness, trembling or very little interest in feeding. In puppies, these signs can worsen quickly. For a puppy too weak to suckle, VCA says the vet can show alternative feeding methods or help with tube feeding.

Go to an emergency vet right away if the puppy is limp, struggling to breathe, or cold and unresponsive. For more ways to feed puppies gently, browse our slow feeder dog bowls.

This page is general information, not veterinary advice, and it cannot replace an examination by the vet who knows your pet.