There are a lot of cats and dogs out there that love anything to do with water.
Take this puppy for instance. She's more than happy to dive head-first into a kiddie pool and investigate a goldfish, but she has to do it with some semblance of class, and refuses to get her hindquarters wet.
Pets can get dehydrated quickly during hot summer months, and the ASPCA recommends providing plenty of shade and clean water when keeping your animals outdoors. If you're looking for a companion of your own and are ready for the responsibility, take a look at the group's adoption site or Petfinder.com.