To keep themselves clean. Dogs do not bath as humans do so they need some method of keeping clean. Just like cats they clean themselves with their tongues.
Dogs Like/sniff other dog butts to get information about the dog. It is a form of communitcating.
Other dogs butts
by kissing your poo and licking dogs
When dogs sniff each others butts it's like when we shake hands. It's a greeting. (Don't go around sniffing people's butts.)
because they want ot at there poopy
dogs butts carry the information
dogs butts carry the information
It isn't so much their "butts" as their TAILS they chase, because they find it fun, or distracting when they have nothing else to do.
No, that's the reason why they chase their tails. ;)
Cause its fun for them and its a way 2 say ello XD
Dogs sniff each others butts because it is their way of saying hello
yes all dog females have babies out of there bedongkidongks