We are currently looking into changing our neutered 6 year old male cat's diet due to several issues we've had with him over the last couple of years since we adopted him when he was 4. When we got him he was sterilised but not chipped, he came with wet food and toys. In the coming months since we got him we wanted to give him the best possible nutrients in food etc., so we got him the dry Wellness Core Chicken, but about a year later his issues started with struvite crystals (likely from the Wellness Core food being high in pH?), so the vet advised Urinary special food, either Royal Canin or Pets Hills, we chose Hills C/D Multicare - so we got the dry food as we have an automatic feeder, dry food is also the most convenient for us. While the crystals were disappearing from being on the new food, the vet also prescribed Meloxidyl to reduce inflammation. Though later on due to the new low quality (?) dry food he started to have digestive issues (really hard stools which he couldn't pass easily) - likely related to the anti-inflammatory medication and new dry food, so the vet prescribed laxatives and antibiotics which stressed him out greatly. He has consistently demonstrated a variety of symptoms over the last couple of years, such as a rippling back and excessive grooming of his back legs, tail and anus/groin area, which is why we got a cat behavioural therapist in to determine whether his issues are due to stress or not. She observed him for several hours and came to the conclusion that he is not a stressed cat. The issues appear to be internal. The therapist recommended making some changes to the litter and his diet, in the past couple of weeks we swapped the Hills Urinary C/D Multicare for Urinary C/D Stress hoping to calm him down and so we've been giving him the following: 14g Hills Urinary C/D Multicare (dry with some water) in the morning to finish it off 1 x 85g sachet of Hills Urinary Stress C/D at lunch with added water 1 x 85g sachet of Hills Urinary Stress C/D in the evening with added water (Likely we need to increase the food dosage, but according to the vet he also needs to loose 400g.) After doing some research and asking around, many cat owners have had great success with Royal Canin's veterinary range, and so we would like some guidance on which food to give him (ideally wet food) considering our cat's susceptibility to struvite crystals and digestive bowel issues as well as stress(?). Do you recommend a Urinary product, or as long as it's S/O we could use the Digestive or Gastrointestinal Fiber Response, Calm etc.? Can we combine food such a urinary product with another product which is for example high in fibre/protein or calming and get the best of all worlds? Could his fits/agitation/stress be a result of: Stress Constipation Osteoporosis Arthritis Or based on the above, we need to look at something completely different? Sorry for the long story!