5 Reasons Why Your Dog is Losing Weight

Has your dog suddenly started to lose weight? 

Or perhaps you suspect that they have been gradually dropping pounds for quite a while now? 

Dog Is Losing Weight

Either way, it can be extremely worrying as a dog owner when your four-legged friend starts to appear gaunt and malnourished. 

There are several reasons why your dog may be losing weight, including an underlining health problem or a behavioral issue. 

Below are the five most common reasons a dog will lose weight, plus advice on overcoming each concern. 

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Changing dog food

If you have recently changed your dog’s diet, this could cause unexplained weight loss. In fact, this is one of the leading causes of weight loss in pets. Even if you haven’t changed your dog food brand, it is possible that the manufacturer has changed the ingredients or formula, meaning that although your dog is eating the same amount of food, they could be getting fewer calories. 

If this is the case, you may want to consider a weight gainer for dogs, such as this one from Buddy & Lola, that can help them to gain weight naturally and safely.

Intestinal parasites

Even if you make sure that your dog has regular deworming treatments, it is still possible for them to be infected with an intestinal parasite or heartworm. For example, many deworming treatments do not protect against whipworms that your dog can get from ingesting eggs from contaminated water or soil. 

If your dog is eating a lot of food but still losing weight, a parasite could be the cause. Fortunately, these are easily treated with medication. 


If you have an older dog, especially a female one, then diabetes could be the reason your companion is losing weight. Dogs who suffer from diabetes struggle to get energy from glucose and therefore try to convert fat or protein into glucose instead, causing weight loss. 

Dogs with diabetes tend to lose weight and muscle mass very quickly and may show signs of excessive thirst. If you suspect your dog may have diabetes, you should make an appointment with your vet as soon as possible. 

Dental problems

Dogs who have gum disease, gingivitis, or infected teeth are likely to experience pain when eating, making it difficult for them to eat, which leads to weight loss. Other common symptoms of dental disease are bad breath, excessive drooling, and swollen or bleeding gums. If dental disease is left untreated, it can lead to heart, liver, and kidney problems. 


There are many different types of cancer in dogs, with many not showing any clear symptoms until they have spread significantly in the body. Cancer is much more common in older dogs, but it can occur in younger ones also. Weight loss can occur with all cancers but is most common with osteosarcoma, hemangiosarcoma, and lymphoma. 

If you are worried your dog’s weight loss may be due to cancer, you should make an appointment with your vet immediately. However, as there are so many causes of weight loss in dogs, many of which can be easily treated, try not to panic unnecessarily before you have had a diagnosis. 

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Richard Hayes

Hey there! Meet Richard Hayes, the big boss and marketing guru behind Pet Dog Planet. He's been a total doggo fanatic since forever and loves all kinds of pups, from tiny teacup Chihuahuas to big, burly Bulldogs. His absolute favorite pastime? Snuggling with adorable puppies—he can't get enough of those cute little faces! Plus, he's totally into iced coffee, chilling in hammocks, and, of course, more puppy cuddling!

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