If your dog has a skin allergy, diarrhoea or symptoms of IBD your vet might ask you to carry out a food trial at home in case their symptoms are triggered by something in their food.
Pockets in between skin folds get very warm and moist. This makes a perfect environment for bacteria and yeast to grow and infections to develop.
Being unable to pee is a life threatening condition. If your cat is unable to pass urine, this could indicate a blocked bladder. Call your vet for advice ASAP is having trouble peeing.