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. ;)
Dogs Like/sniff other dog butts to get information about the dog. It is a form of communitcating.
Other dogs butts
Many dogs will. You can train them not to but most dogs instinct is to chase critters like squirrels.
by kissing your poo and licking dogs
Because they're dogs and dogs like to chase things.
Dogs will chase things that run, that is instinct.
because they want ot at there poopy
dogs butts carry the information
dogs butts carry the information
Dogs may rub their butts on the carpet to relieve itching or discomfort caused by issues like anal gland problems, parasites, or skin irritation.
The same reason they chase cats and squirrels and mice. Dogs are predators. Predators chase things to kill and eat.