Do Dogs Drink Milk? Safety, Benefits & Lactose Intolerance

Do dogs drink milk? Many will happily lap it up, and some dogs can have a small amount without obvious problems. But milk isn’t a necessary part of a dog’s diet, and many adult dogs don’t digest lactose well, so it can cause diarrhea, gas or an upset stomach. Every dog reacts differently. If you’re unsure, ask your veterinarian.

Maybe your dog cleaned up a spilled cereal bowl, or you’re wondering whether a splash of milk is a harmless treat. This guide explains what milk does in a dog’s body, the signs of lactose intolerance, the difference between puppies and adult dogs, whether lactose-free milk or goat milk is any better, and what to do if your dog drinks too much.

Do Dogs Drink Milk? The Short Answer

Yes, most dogs will drink milk if you offer it, and many enjoy the taste. That doesn’t mean it’s good for them. The ASPCA explains that pets don’t have significant amounts of lactase, the enzyme that breaks down milk sugar, so milk and other dairy foods can cause diarrhea or other digestive upset.

Dogs don’t need milk after they’re weaned. A complete and balanced dog food provides the nutrients they need, and clean, fresh water should always be their main drink.

Can Dogs Have Milk Safely?

Some dogs can have a small amount of plain milk now and then without problems. The American Kennel Club (AKC) says milk should be given only in moderation, and notes that many dogs are lactose intolerant.

Whether your dog can have milk depends on the individual:

• Digestive tolerance. One dog may be fine after a lick of milk, while another gets diarrhea from a small amount.
• Size. The same amount of milk is a much bigger share of a small dog’s daily intake.
• Age. Puppies and adult dogs have different nutritional needs.
• Health. Dogs with a sensitive stomach, a history of pancreatitis or a special diet may need to avoid dairy completely.

Liking the taste doesn’t make milk safe. Dogs happily eat plenty of things that disagree with them. If your dog has reacted badly to dairy before, it’s best to skip it. The AKC also advises checking with your veterinarian before adding anything new to your dog’s diet.

Is Milk Good for Dogs or Is Milk Bad for Dogs?

Is milk good for dogs? Cow’s milk contains protein, calcium and other nutrients, but that doesn’t make it necessary. A dog eating a complete and balanced diet already gets these nutrients in the right proportions. Milk isn’t a supplement, and it isn’t a treatment for any health problem.

Is milk bad for dogs? It isn’t toxic, but it has real drawbacks:

• Lactose. Many dogs can’t break it down well, which can lead to stomach upset.
• Fat and calories. The AKC notes milk is high in fat and natural sugars. Too much can contribute to obesity, and the AKC links excess fat and sugar to pancreatitis.
• Unneeded extras. Regular milk adds calories without filling a nutritional gap.

A small accidental taste is very different from giving milk every day. An occasional lick is unlikely to cause harm in a healthy dog that tolerates dairy, but making milk a regular habit isn’t recommended.

Why Are Some Dogs Lactose Intolerant?

Lactose is the natural sugar in milk. To digest it, the body uses an enzyme called lactase to split lactose into simpler sugars that can be absorbed. The ASPCA notes that pets don’t have significant amounts of lactase. When lactose isn’t broken down, it moves further along the gut, where it can draw in water and be fermented by gut bacteria. That’s what can lead to loose stools, gas and bloating.

VCA Animal Hospitals describes lactose intolerance as the most common carbohydrate reaction in dogs, with signs such as diarrhea, bloating and abdominal discomfort after drinking cow’s or goat’s milk. How much lactose a dog can handle varies. Some dogs seem fine with a lick of milk, and others react to very little.

Signs Your Dog Has an Upset Stomach After Drinking Milk

According to the AKC and VCA, signs of a dog upset stomach after milk can include:

• diarrhea or loose stools
• gas
• bloating
• vomiting
• abdominal discomfort, such as restlessness or a tense belly
• a change in appetite

These signs can have many other causes. The AKC’s guide to dog diarrhea lists sudden diet changes, eating garbage, stress, parasites, infections and pancreatitis, among others. So don’t assume milk is to blame, especially if your dog has also eaten something else.

Can Puppies Drink Milk?

Puppies need milk, but not cow’s milk. During their first weeks, they depend on their mother’s milk. If a puppy is orphaned or can’t nurse, it needs a commercial canine milk replacer under your veterinarian’s guidance.

Can puppies drink cow’s milk? It isn’t a good substitute. VCA explains that cow’s milk is not ideal for orphaned puppies because it has much less protein and more lactose than a mother dog’s milk, and that commercial puppy milk replacers are recommended instead.

VCA notes that weaning usually begins at around 3 to 4 weeks of age, with puppies moving fully to solid puppy food by about 5 to 6 weeks. The transition should be gradual. Contact your vet right away if a puppy is orphaned, isn’t nursing, seems weak or isn’t gaining weight.

Can Adult Dogs Drink Milk?

Some adult dogs tolerate a small amount of milk, but many handle it poorly. Once they’re weaned onto solid food, dogs no longer need milk at all. Their bodies may also be less able to digest lactose than when they were nursing.

For adult dogs:

• milk should never replace water or a complete and balanced diet
• any milk should be plain, with no sugar, chocolate, flavorings or sweeteners
• a dog that has had diarrhea or vomiting after dairy before shouldn’t be given it again
• dogs with a history of pancreatitis, weight problems or digestive disease should avoid it unless your vet says otherwise

Lactose-Free Milk for Dogs: Is It a Better Choice?

Lactose-free milk is regular cow’s milk that’s been treated so most of its lactose is already broken down, usually by adding the lactase enzyme. It still contains milk proteins, fat and calories. Only the lactose has changed.

Because lactose is the most common reason dairy upsets dogs, lactose-free milk for dogs may cause fewer lactose-related problems than ordinary milk. That doesn’t make it healthy or necessary:

• It’s still high in fat and calories. The AKC links too much fat and sugar in milk to obesity and pancreatitis.
• Milk proteins remain. A dog with a milk protein allergy can still react, because lactose-free milk only removes the sugar.
• Added ingredients matter. Avoid flavored, sweetened, chocolate or “creamer” products. The ASPCA advises reading the full ingredient list and checking the sweetener, since xylitol can cause life-threatening low blood sugar and liver injury in dogs.
• Any new food can upset some stomachs. The ASPCA notes that even safe products can still cause vomiting or diarrhea.

Can Dogs Drink Lactose-Free Milk?

Can dogs drink lactose free milk? Some can, in a small amount. If lactose is your dog’s problem, plain lactose-free milk may be better tolerated than regular milk. But it isn’t something dogs need, and it can still cause digestive upset, weight gain or allergy signs in some dogs.

Ask your veterinarian before offering it, especially if your dog has a sensitive stomach, food allergies, pancreatitis, diabetes or a weight problem, or is on a prescription diet. The ASPCA also recommends checking with your vet before making major diet changes.

Is Goat Milk Safe for Dogs?

Goat milk for dogs is often marketed as a gentler option, but it isn’t lactose-free. VCA lists diarrhea, bloating and abdominal discomfort after cow’s or goat’s milk as signs of lactose intolerance. A dog that reacts to cow’s milk may react to goat milk too.

• Fat and calories still count. Goat milk adds calories without filling a nutritional gap in a balanced diet.
• It’s not for puppies. PetMD (in an article by veterinarian Sandra C. Mitchell, DVM) says puppies shouldn’t get cow or goat milk, since neither is made with dogs in mind.
• Choose pasteurized only. The AVMA discourages feeding raw animal-source foods, including unpasteurized milk, because they can carry bacteria such as Salmonella, Listeria and E. coli that can make pets and people sick.
• Read the label. Pet goat-milk products may contain added ingredients, and they aren’t a replacement for complete and balanced dog food.

There’s no strong evidence that goat milk treats any condition or is easier for every dog to digest. If you’re curious, ask your vet first.

How Much Milk Is Too Much for a Dog?

There’s no single safe amount that works for every dog. A sensitive dog may get an upset stomach from a few laps, while another dog seems fine. The AKC notes that large amounts of milk can cause vomiting and diarrhea even in dogs that aren’t lactose intolerant.

Keep these points in mind:

• the more milk a dog drinks, the greater the chance of stomach upset
• small dogs are affected by smaller amounts than large dogs
• milk adds calories, so it counts toward your dog’s daily treat allowance
• a bowl of milk as a daily habit isn’t recommended

If you’d like to give your dog dairy or other extras, ask your veterinarian what fits your dog’s size, age, health and diet.