There are many things to check out for to determine if your animal is dehydrated or not. Some of these symptoms may be noticed by Veterinary professionals while some others are signs or symptoms that non professionals can notice such as but not limited to, Dry nostrils/muzzle, sunken eyes, panting, loss of skin elasticity which can be determined by pulling the skin over the neck up and letting it go. The skin should snap right back in place while in dehydrated animals, the skin returns more slowly.