Food Supplements

Hello!
I have a one-year-old Turkish Angora and I want to improve his diet. All of my cats except for him are eating a dry kibble that is supposed to lessen the chances of them getting urinary crystals. He gets extremely sick every time he eats even the tiniest bit of it.
I've heard that there are little biscuits I can give to him instead, as well as giving him a good amount of wet food.
Has anyone heard of these biscuit supplements I'm talking about? And if so, does anyone have some recommended brands?

Hi @kittypigwidgeon  Welcome to The Cat Site.

By little biscuits do you mean dry treats? Or is there some specific supplement that you want to try? There are lots of dry treats available, but if your other cat's dry food makes him sick I'd be wary of trying some of them.

What's the problem with the dry food? Does he have an allergy to it? 

@norachan
I'm not sure exactly sure what I want to give him, but I just want to lessen the chance of him getting urinary crystals. He mainly eats dry food right now and he drinks a lot of water, but I just remember briefly reading about dietary supplements that could help too.
I'm not really sure why he can't eat the food that the rest of my cats are eating. My vet recommended it for all of my cats after one of them had a crystal scare, but he just gets sick an hour or so after eating it.

There are all kinds of potential allergens in most prescription veterinary foods - grains/cereals of various sorts often being the primary culprit.

To be honest, the absolute BEST thing you can do to prevent crystals is to feed a high meat/low carb wet or raw diet. Dehydration is one of the biggest issues with crystals, as the more concentrated the urine, the higher the likelihood of crystals forming in the first place. Proper hydration is the single best thing you can do, and that is most easily achieved with a wet/raw diet. Cats are desert creatures, and have evolved to get around 80% of their fluid intake from their food. Because of this, their thirst drive simply isn't strong enough to compensate for the dryness of kibble without special measures being implemented (water fountains, flavoured water etc. You'll find more ideas in [article="30756"]​[/article]). If feeding an all dry diet, each cat will need to be drinking around 1 cup/8 fl oz/250mls of water a day.

I do appreciate that not everyone can feed an all wet diet, but wet food really is the easiest way to get water into cats. Very often, a mix of wet and dry is the best compromise, and is what I do myself