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My cat is constipated and won't eat his Rx food. What can I give?

Updated On September 23rd, 2025

Pet's info: Cat | Mixed Breed | Male | 8 years and 11 months old | 12 lbs

My cat has constipation & the lactose given by my vet doesn’t help He is also on Royal Canin Rx food for urinary crystals For about 2 years & now he won’t eat it. He’s been to the hospital 2x with the same problem & was given enemas & was then fine His X-rays were clear. Is there anything the counter I can give him & can I try a different wet food as well?

1 Answer

Most Helpful Answer

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Answered By C. Rathjens, DVM

Veterinarian

Published on January 27th, 2019

There's not perfect answer there, but if he's not really eating the prescription food anyways AND the food would only help if he was drinking enough water to have dilute urine, which I'm guessing he isn't because he's constipated, then changing foods is unlikely to cause problems. With what you're describing, he could even need subcutaneous fluids at home to get enough water in him. I'm assuming he's had general bloodwork done to try to figure out what's going on, because I would be concerned about some underlying organ dysfunction being involved here. If blood work is normal, I'd experiment with diets, water fountains, and even the fluids under the skin to see if any of that helps. Wishing you and Flash the best of luck

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