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Thanks for using Boop by Petco! There is diet that would be perfect for him because it can help him lose weight and it is also well-balanced. It is the Science Diet metabolic weight management diet. If you wish to not use a weight loss diet then any of the Science Diet foods for adult cats would be great for him. Good luck and have a great day!
Thanks for trying to be proactive about Fici's health! It's a shame you cannot get the Metabolic diet shipped to you as this diet is great for weight loss. An Alternative for Fici is Royal Canin Weight Control. I'd recommend feeding an all canned diet as this is more likely to help with weight loss than dry foods. If you cannot find any prescription diets then another type of canned food may still help with weight loss. Weruva makes canned foods that tend to be lower in calories and are available in pet stores or online. Thanks for using Boop by Petco and good luck with Fici!
Well done in researching this so well! Any dryfood would be recommended to be urinary focused as wet food in itself contributes to urine dilution and is more forgiving in this regard. I would recommend royal canin urinary moderate calorie (which comes in wet and dry) and can be very effective in weight reduction whilst promoting urinary health
The best way to maintain his weight at 12 lbs is to measure his food and count the calories. A typical 12 lb cat should eat about 230 calories total in a day. Look at the calorie content of the food your vet prescribed and feed based on the calories per cup or per can. It is probably fine to switch to urinary care with weight management but you should check with your vet first since it is prescription diet. I would also recommend asking your vet about feeding some canned urinary food as most cats with crystals should be fed canned food, too.
I recommend changing his diet to a specialized weight management diet such as hills metabolic so he can feel full and receive all the necessary nutrition to be healthy, whilst still losing and then maintaining weight. Mist vets offices provide free weight clinics to monitor and advise on feeding such diets and maintaining health and fitness