What is the setting of A Dog's Purpose by W. Bruce Cameron?

The novel takes place in different places during the different lifetimes of the dog. The setting for the first lifetime of the dog is at first the den under a large tree on a river bank where the feral mother hides her pups. Then when they are caught by Senora's workmen, they are put in the Yard, an area enclosed by a tall wooden fence, where many dogs of different sizes, breeds, and temperaments live. The only other place the dog experiences in this lifetime is the animal hospital where in a cool room he is neutered and then put to sleep when his foreleg is so badly injured and he is not able to be adopted.