Helping cats and dogs live their healthiest lives.
Sacred Birman kitten stood next to an adult Yorskhire Terrier in black and white.

Promotes digestive health and optimal stool quality with highly digestible proteins and prebiotics

Formulated to help manage GI health and common gastrointestinal sensitivities

Enriched with a blend of soluble and insoluble fibers for healthy transit through the GI tract

Supports urinary health with the exclusive S/O Index, which creates an environment unfavorable to crystal formation in the bladder

You’ve tried everything to help with your cat's GI issues, whether those are vomiting, diarrhea, or lack of appetite. And while bland homemade diets are often used for digestive upsets, your cat could be missing some key nutrients to help them fully recover. But with the help of your veterinarian and Royal Canin, there’s not just hope—there can be a true difference.

This high fiber cat food is specially formulated with a blend of soluble and insoluble fibers to aid with intestinal movement for your cat’s GI upsets. Prebiotics help maintain the balance of good bacteria in the gut. A blend of dietary fibers supports healthy digestion for optimal stool quality. Omega-3 fatty acids, EPA and DHA, from fish oil help nourish and soothe the GI tract. And the exclusive S/O Index supports urinary health by creating an environment unfavorable to crystal formation in the bladder.

Brewers rice, chicken by-product meal, corn, chicken fat, corn gluten meal, wheat gluten, psyllium seed husk, natural flavors, dried chicory root, egg product, potassium chloride, fish oil, calcium sulfate, sodium pyrophosphate, monocalcium phosphate, fructooligosaccharides, DL-methionine, choline chloride, vegetable oil, salt, taurine, hydrolyzed yeast, vitamins [DL-alpha tocopherol acetate (source of vitamin E), L-ascorbyl-2-polyphosphate (source of vitamin C), niacin supplement, biotin, riboflavin supplement, D-calcium pantothenate, pyridoxine hydrochloride (vitamin B6), vitamin A acetate, thiamine mononitrate (vitamin B1), vitamin B12 supplement, folic acid, vitamin D3 supplement], L-lysine, trace minerals [zinc proteinate, zinc oxide, manganese proteinate, ferrous sulfate, manganous oxide, copper sulfate, calcium iodate, sodium selenite, copper proteinate], marigold extract (Tagetes erecta L.), rosemary extract, preserved with mixed tocopherols and citric acid.

Calorie Content

This diet contains 3690 kilocalories of metabolizable energy (ME) per kilogram or 362 kilocalories ME per cup on an as fed basis (calculated).

Crude Protein (min) 29.0%
Crude Fat (min) 13.0%
Crude Fiber (max) 4.7%
Moisture (max) 8.0%
Eicosapentaenoic Acid (EPA)* (min) 0.18%
Docosahexaenoic Acid (DHA)* (min) 0.08%

*Not recognized as an essential nutrient by the AAFCO Cat Food Nutrient Profiles.

Weight Low Activity - Cups Medium Activity - Cups High Activity - Cups
4.4 lb (2 g) 1/4 (26 g) 3/8 (33 g) 3/8 (39 g)
5.5 lb (2.5 g) 3/8 (31 g) 3/8 (38 g) 1/2 (46 g)
6.6 lb (3 g) 3/8 (35 g) 3/8 (43 g) 1/2 (52 g)
7.7 lb (3.5 g) 3/8 (39 g) 1/2 (48 g) 5/8 (58 g)
8.8 lb (4 g) 3/8 (43 g) 1/2 (53 g) 5/8 (64 g)
9.9 lb (4.5 g) 1/2 (46 g) 5/8 (58 g) 3/4 (69 g)
11 lb (5 g) 1/2 (50 g) 5/8 (62 g) 3/4 (75 g)
12 lb (5.5 g) 1/2 (53 g) 5/8 (67 g) 7/8 (80 g)
13 lb (6 g) 5/8 (57 g) 3/4 (71 g) 7/8 (85 g)
14 lb (6.5 g) 5/8 (60 g) 3/4 (75 g) 7/8 (90 g)
15 lb (7 g) 5/8 (63 g) 3/4 (79 g) 1 (95 g)
17 lb (7.5 g) 5/8 (67 g) 7/8 (83 g) 1 (100 g)
18 lb (8 g) 3/4 (70 g) 7/8 (87 g) 1 1/8 (105 g)
19 lb (8.5 g) 3/4 (73 g) 7/8 (91 g) 1 1/8 (109 g)
Royal Canin Veterinary Diet Feline Gastrointestinal Fiber Response Dry Cat Food

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Customer reviews

mkdepp
30 Dec 2020

Life saver for my cat

Coming back here about 4 years later with an update. This food is still absolutely the best thing I've ever done for my cat. After being chronically constipated off and on for years and eventually being at the vet for 3 days where she had 2 enemas and lost so much weight, the vet prescribed this food for her (about 4 years ago now). Her stools are formed and seem easy for her to pass, she's a healthy weight, and her coat is silky. We haven't had any constipation or vomiting issues since. And, she still comes running when I shake the bag! Thank you Royal Canin!!
Royal Canin response
Wonderful to hear! Thank you for sharing your success!
Kittymama
09 Dec 2020

Made a big difference

My kitty had a mishap with a car and lost partial function of his bowels. This food, as well as a stool softener and laxative, helps prevent stool impaction and frequent trips to the vet for enemas. Even after 7 years of the same food flavor, he still comes running when I shake the bag.
RaeD
21 Nov 2020

Like the others have said - literal life saver

My cat was experiencing severe constipation for over a year. She would pass rock hard stool every few days. I tried other prescription GI foods with no success. Eventually my cat suffered liver issues which brought her to the vet for 10 days. After giving enemas for the constipation they put her on this food and she finally started passing normal stools. It’s been about three months now and she is doing so well and is so healthy! Absolutely worth the money for this. I do wish it came in bigger bags just so I didn’t have to order so often but I can deal with that!
Joyous1
19 Nov 2020

FELINE GI FIBER RESPONSE- DRY & CANNED

My 6mth old Maine Coon was troubled w awful stinky diarrhea..after numerous tests, food, etc,, they finally found the reason and added this food...WOW what a difference) We have been fans of RC for ~20yrs, so it did not surprize us) AND MOST IMPORTANT..KITTY LOVES IT)
Paladin246
16 Nov 2020

Well worth a Healthy, Happy Cat

Vet prescribed this for one of my cats and it works great, but I had a feral that we brought in as she was not doing well. Megacolon too. She would spend half an hour to poop and then hardened "balls" of poop would fall out in the room she stayed. Put her on this and she loves it. Now bowel movements are normal and no issues of straining. Yes it is more costly than other food but to see her so much better now along with the cat they prescribed this for is worth the price if you love cats and want to see them healthy and happy.
Royal Canin response
Great to hear that your cats are doing well!
Bishoy
15 Nov 2020

Excellent product

This is THE BEST PRODUCT for cats wih constipation My baby boy had a rough year struggling with constipation, that he used to pass stool every 2-3 days wih difficulty, but now after I got him this AWESOME product he immediately got better and the problem resolved in less than 24 hours Thanks Royal Canin
Suzanne1012001
09 Oct 2020

This is good stuff! My cats love it and it solves poop problems and prevents megacolon. Kind of expensive but well worth it, will prevent visits to the vet.
Jaylee
20 Sep 2020

Tried everything

Happened to stumble on this miracle when researching another problem i was having with my other cat. After three years of every kind of Vet recommend solution including laxatives,miralax , cisapride, and yes numerous enemas for my now 16 year old Bosco thank God i came across Royal Canin Gastrointestinal fiber i feel it literally saved his life ! He goes regularly and is back to his old self, and so i'm i . if you've tried every thing else and at your ends rope what do you have to lose ...
Alohai
14 Aug 2020

LIFE SAVER! I'm serious

Where do I even start? A few months ago, I noticed my cat behaving differently and he lost his appetite. We took him to the vet and it turned out that he had severe constipation and he had to undergo several enemas and eventually a deobstipation which costed SO MUCH money. After that, Doctor suggested that we give Miralax with each of his meals. We thought everything was fine until he didn't go to the restroom in 6 days. We took him to the vet again and he had to undergo enemas. This time, a different doctor suggested this dry food. Of course, my initial thought was that Royal Canin is super expensive compared to other cat foods. However, I tried it out and this is the only thing that worked for my cat! I wish that the first Doctor had told us about this so that we did not have to waste more visits to the vet to get more enemas. THIS PRODUCT IS WORTH EVERY PENNY! I usually don't write reviews but I was so desperate to help my cat and for the people out there with similar problems, you have to try this out. My cat has been going now and I'm so glad this product is out there.
Cat Relief
11 Dec 2019

Miraculous Results

Our cat had to see the vet twice in the last year due to constipation and impacted bowels. This required her to be put under with anesthesia. In addition she was treated with a regiment of Lactulose and Miralax with mixed results. After the second visit the vet prescribed Feline Gastrointestinal Fiber Response™ Dry Cat Food. The results were almost immediate! She goes regularly and has well formed stools with normal consistency. It is worth every penny!