HEALTHY DIGESTION: Highly digestible proteins and prebiotics promote digestive health and optimal stool quality

CAT GI HEALTH: Formulated to help manage GI health and common gastrointestinal sensitivities

HEALTHY FIBERS: A blend of soluble and insoluble fibers promote cat digestive health and healthy transit through the GI tract

URINARY SUPPORT: The exclusive S/O Index, which creates an environment unfavorable to crystal formation in the bladder, supports urinary health

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.

Working towards a sustainable future

Our belief that pets make our world better inspires and gives life to our purpose of making a better A BETTER WORLD FOR PETS ™

Discover more
Labrador Retriever adult sitting with its owner outdoors


Discover our tool that calculates the daily portion for your pet. Fill in your pet's information and you will get their daily feeding recommendation. In case of weight issues, do not hesitate to consult your vet to adapt this portion. Note that this feeding recommendation is more precise than the feeding table, therefore the values may slightly differ.


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)
Gastrointestinal Fiber Response Dry Cat Food

Still have questions about this product?

Find out how to reach us, and get in touch.

Ask a question

Customer reviews

11 Sep 2022

Food works, but goes bad quickly

This food works great for my kitty’s tummy issues and we’ve been using it since 2020. However, it seems something changed this year because the food is going bad before we can finish the bag. This is causing considerable issues because she’s getting sick and I’m throwing half the bag away. I wish there was a smaller bag, even more expensive per pound, so that I’m not being wasteful and making my kitty sick.
01 Jun 2022

Excellent food

Been using this food for almost a year and my cats have never looked and felt better. Both cats are now regular.
31 May 2022

Really helps!

This is the only cat food I have found that helps with my cats digestive issues.
31 May 2022

Excellent food!

My female cat use to suffer from constipation; vet recommended this food & since then she has no issues! It’s been years and she is still healthy!! This food Keeps my cats regular and healthy!
05 Feb 2022

Mega Colon Cat

I don’t want to speak too soon, and jinx our good luck with this product but 10 STARS! We have been dealing with our cats mega colon issue since July of 2021. She stopped completely going to the bathroom. She was put on cisapride 2x a day, lactulose 3x a day, Miralax, pumpkin, chia seeds, enemas galore, therapy, you name it, we have done it !!!! Last weekend I discussed with her vet doing the surgery to remove her colon. Got an estimate from the surgeon for $2500-5k with no guarantee of would even work. We were broken and at a loss! This was our last hope! She had been on the hills fiber response but it stopped working. I read all these great reviews and gave it a try ! The first night she had a BM!!!! We were shocked! Thought it was too good to be true ! Continued the food, and fast forward, she has had a BM EVERY SINGLE NIGHT! From talking about possible euthanasia and surgery last weekend to a completely different cat 1 week later !!! I am so happy I do not have to do an enema this weekend !!!!!!! Thank you RC! I know it has only been a week but so far so good! You saved my girl <3
12 Jan 2022

It’s ok

I’ve been using this good per my vet for 4 years one cat passed away at 12 the other 6 months later I’m still using it fir my other 2 we shall see I really wish for such a high priced food $58 is rediculous! I can’t afford it anymore and the first ingredient isn’t even chicken It’s a by product meal just like the cheap food I don’t get how you cam charge outrageous prices for that
11 Jan 2022

Solved her chronic constipation.

My 10 year old Maine Coon was constantly getting severe constipation were she made several trips to vet to get "cleaned" out. After trying several various meds (which is hard giving a cat) Her Vet recommended trying Royal Canin Gastrointestinal Fiber response dry food. Almost immediately her constipation was a thing of the past. She has been having regular BM's daily! And she loves it. She does a dance every time I bring out the bag. She is acting like a frisky teenager again!
Royal Canin response
Great to hear she is doing so well. Thank you for sharing!
16 Dec 2021

Life Saver

We found a little kitten on a jobsite. We took him home & noticed that he wasn't pooping. We took him to the vet & they had to do an intestinal flush & he was diagnosed with megacolon. He was immediately put on Fiber response gastrointestinal formula & hasn't had any other issues for the last 6 years while he's been on this life saving formula. I would HIGHLY recommend this formula & we always have an ample supply stocked! Thank you Royal Canin for all of the great work that you do!
Royal Canin response
Great to hear!
14 Nov 2021

Life saver

This food saved my cat with megacolon from surgery and dramatically improved his quality of life. I have an 8 year-old Maine coon who started having severe constipation about 2 years ago. He was miserable, in pain, and not very active. After several trips to my regular vet and the emergency vet and several hundred dollars spent, he was diagnosed with megacolon. He had tried everything from lactulose, Miralax, and finally cisapride. He also had tried all kinds of different types of prescription foods, but nothing seemed to really help. I read about this food for cats with megacolon and asked my vet about, and we decided to give it a try. After just a month on the food, he no longer needed any other meds. I also was able to mix this food 50/50 with another food and it has worked just as well. It’s been over a year now, and the food has completely eliminated any issues with constipation. In addition, I feed my other cat this food and they both love it!
28 Oct 2021

Keeps our two cats regular!

Life saver. We have a rescue cat Rocky, w one eye as his hind quarters had been run over by car at 5 weeks old. We adopted him after that. He has lost some feeling in legs although he walks ok, a little wably but doc was concerned w his stools. He does great. We also have a big Maine Coone at 23#, Maximus. We had had a Burmese several years ago who had large intestine removed at MSU due to mega colon. I was worried our big cat would have difficulty do vet says this food is good for him too! Highly recommend it!!! Expensive but so worth it!!
Royal Canin response
Great review and great feedback, thank you!