Dog carriers are useful tools to have when you own a dog, and come in many different sizes as well. They are most useful when you have to take your dog somewhere such as the vet, the park, or even on an airplane. Dog carriers can also be used as a discipline tool when you are home. For example, if your dog is trying to attack a visitor, you can put him in his dog carrier for bikes until he calms down. Having a dog carrier for your dog can put you at ease in many situations, knowing that your dog is safe either in transport or the home.