Fiber for Dogs: Benefits and How To Add It to Your Dog’s Diet

Dietary fibers are non-digestible carbohydrates primarily found in plants.  

There are two types of fibers:  

• Insoluble fibers: These fibers don’t dissolve in water and pass through the gut largely unchanged, adding bulk to the stool and supporting normal gastrointestinal (GI) movement. Cellulose is an example of insoluble fiber. 
• Soluble fibers: Fibers such as guar gum, pectin, and carrageenan, all found in dog food, dissolve in water and can often be fermented by gut bacteria, which promotes digestive health and the immune system.  

Some fiber sources, like beet pulp, psyllium husk, oats, and barley (all found in dog food), have a mix of both types of fiber. 

Yes, fiber is good for dogs. In fact, most dogs benefit from a diet that contains both soluble and insoluble fiber. The combo is good for dogs because it: 

• Supports the gut microbiome, which can improve GI health and immune function 
• Encourages the movement of food through the gut and the formation of regular, well-formed stools 

Yes, it might come as a surprise, but fiber can be bad for dogs if they get too much of it.  

Signs your dog may be getting too much fiber include: 

• Excessive gas 
• Diarrhea 
• Constipation 
• Decreased appetite  

Symptoms caused by excessive fiber will usually resolve once fiber is reduced, but call your veterinarian for advice if problems continue for more than 24 hours. 

Your dog’s veterinarian may recommend a high-fiber diet for these conditions: 

• Weight management: Fiber helps dogs on a diet feel full when eating fewer calories. 
• Constipation: Insoluble fiber adds bulk to poop and can help with bowel movements. However, fiber can sometimes worsen constipation—for example, when the passageway for poop is narrowed or blocked. 
• Diarrhea: Both soluble and insoluble fiber can have beneficial effects, depending on the cause of the diarrhea. 
• Anal gland impactions: Bulkier stools promote natural anal gland expression. 
• Diabetes mellitus: Higher fiber intake slows the absorption of sugar after meals. 

However, every dog may respond differently to fiber, so finding the ideal diet or supplement often requires monitoring and adjustment. 

Always talk to your veterinarian before making a switch.  

It can be tricky to figure out the exact fiber content of dog food—and the dog food label might not be super helpful.  

Your best bet is to always ask your veterinarian for a recommendation. They may suggest a high-fiber dog food, such as:  

• Hill’s Science Diet Adult Perfect Weight Management Wet Dog Food  
• Natural Balance Original Ultra Fat Dogs Dry Dog Food 

In some cases, your vet may even prescribe a therapeutic diet that offers higher fiber levels than over-the-counter options, such as:  

• Hill’s Prescription Diet w/d Multi-Benefit Wet Dog Food  
• Royal Canin Veterinary Diet Adult Satiety Support Weight Management Small Breed Dry Dog Food 

A fiber supplement may make sense when a full diet change isn’t practical or your dog only needs a small or short-term boost.  

Your veterinarian can recommend the right product for your dog, but a few well-rated picks include: 

• Pet Honesty High Fiber Pumpkin Flavored Digestive Powder for Dogs, which mixes easily into food 
• Vetnique Labs Glandex Anal Gland Support with Advanced Strength Fiber Supplement for Dogs, which comes in a tasty chew 

Some dog-safe human foods contain fiber. Although treat-sized amounts are unlikely to make a big difference in your dog’s diet, you could try these options if your vet approves: 

• Apples  
• Carrots 
• Cooked sweet potato  
• Green beans  
• Plain canned pumpkin  

Talk to your veterinarian before making a major change. Only your vet can tell you: 

• If more fiber is appropriate for your dog 
• Whether your dog needs soluble fiber, insoluble fiber, or a mixture of fiber types 
• How much fiber your dog needs 
• Which products are best for your pup 

To prevent an upset stomach, always start with small amounts of fiber and slowly increase to the recommended amount.  

Unless your veterinarian tells you otherwise, take seven to 10 days to completely switch your dog’s diet or get up to the full fiber supplement dose. Monitor how your dog responds, and if you have any concerns, talk to your vet. 

How much fiber do dogs need? 

It depends. Fiber isn’t an essential nutrient for dogs, so there’s no universal recommendation. Most healthy dogs do well on the smaller amounts of fiber contained in typical dog foods, but your veterinarian knows best.  

What is a good source of fiber for dogs? 

Most dogs get all the fiber they need from a complete and balanced dog food, but a vet-prescribed diet can offer more if your dog needs it.  

What is the best high-fiber dog food for constipation? 

There’s no single answer, because constipation has multiple causes. Fiber can help in some cases, but sometimes it can make things worse. Your veterinarian can recommend the best option for your dog.