Have you met the dogIDs spokesdog, River? One of his favorite sports is fetch. If there were a professional fetching team, River would be captain.Playing fetch can be a great form of exercise for a dog, but it can also give the dog a mental workout if there are a few "rules." Adding rules to a simple game is a great way to build a dog's self control. While we want our dogs to have fun, it's also i…
