Dog Health: Lactose Intolerance

Dog | Lactose Intolerance

An Introduction to Lactose Intolerance

Lactose intolerance is an inability to digest the sugar lactose, which is mainly found in dairy products.

Erin Dowler (veterinarian) – May 2014

Dog Lactose Intolerance information

Causes of Lactose Intolerance

Puppies initially have the ability to digest lactose. However, after weaning the level of the enzyme lactase (which is needed to digest lactose) reduces to 10% of its original level. Some dogs no longer have any enzyme and are completely intolerant.

» Read More

Symptoms of Lactose Intolerance


Diarrhoea occurs if a dog ingests more lactose than they can ingest.


Diagnosis is by a trial where exclusion of dairy products resulting in resolution of diarrhea. If re-introducing dairy products causes the diarrhea to occur, this is likely the cause.

» Read More

Treatment of Lactose Intolerance


Dairy products need to be excluded. Sometimes additional management for diarrhea may be required while the dog recovers, such as an easily digestible diet and gastroprotectants.


Do not feed dogs excessive dairy products.


Pet milk is available which is lactose free.

» Read More
Ask our Vet for online dog vet advice - ask the vet for free

Ask the Vet

Dr. Megan Alderson

for free online vet advice

Ask our Nutritionist for online dog nutrition tips & advice.

Ask the Nutritionist

Dr. Erin Dowler

for free online

dog nutrition advice

Dog Breed Masthead

all about dogs

Already a member? Login here.


Sign up with Email


Sign in with Email or Facebook

» Forgotten Your Password?