Dogs have changed alot at the beging dogs were just like squirls but in the past dogs have changed into the kind we know today. There are alot of kinds of dogs like the bull dog and speaking of bull dogs they and their friends the pugs have alot of noise and breathing proplems because of all there floppy skin so if you are planning to get one you better be good friends with a vet! Some dogs live in the wild like hienas who live in Afraca. Some dogs even are gard dogs and some dogs help blind people wihch i think is really cool .