In the past my cat has had urinary issues which caused him multiple rushes to the emergency vet, and a stay at the vets because of a blockage. It’s largely diet related. Because of that he’s been on a vet prescribed food for urinary issues for several years. The problem with that is that the food is loaded with salt and isn’t great overal other than upping his water intake. He’s currently 17 pounds. The other cat is average weight (he also eats less) and doesn’t have urinary problems but he ends up eating the same food, but I’ve noticited he’s been gaining weight as well. I’ve recently decided to try to change their food. My vet has said that we can as long as he’s getting enough water. So I’ve started them on “Petcurean Go! Sensitivity + Shine Limited Ingredient Duck Recipe For Cats” and also do a wet food, the brand is B.F.F. So I do half and half because I can’t afford to do solely wet food. I know cats get most their water intake from food so I’m hoping the implementation of wet food will provide him with enough moisture so that he doesn’t get dehydrated and form crystals. I’m terrified because it almost killed him last time, but I feel like their diet is also super important. Ive been paranoid lately so I’ve been checking their litter box more than usual. Usually my fiancé deals with poop removal, and he says nothing looks different, but I was alarmed to see the poop looks very dark. It is well formed and looks like the same amount as usual. Just very dark. The new food is, however, much darker in color than the last food. I have been feeding a lot more wet food recently as well. It looks like they’ve been drinking enough water, and they are both acting normal. So maybe the poop color is just related to the new kibbles color? I’m just worried. What should I be looking for when a cat is dehydrated? I don’t want him forming crystals again. Will I know before it’s too late?