Why do dogs always like to smell each other?

1, say hello, in fact, dogs will smell each other's ass. The simplest reason is that they are saying hello. Dogs express themselves in this way because they can't talk.

2, observe its body, the dog's sense of smell is very sensitive, so it can smell whether the other party has any diseases, etc., if your dog has given birth to a baby.

3. Collect its information. Different races communicate in different ways. Dogs sometimes collect information about each other by smelling their butts, just like people communicate with each other by texting and making phone calls.

I hope my answer can help you, thank you!