<human>:  What are the pros and cons of adopting a dog?
<bot>: Adopting a dog is a great way to save a life. There are a lot of dogs that need a good home. Adopting a dog can be expensive though, especially if you want a purebred. Dogs are very smart and can be trained to do lots of things. They can be good companions, help you feel less lonely, and can be trained to be a good guard dog.