Humping
Many dogs commonly engage in humping behavior and its not always for sexual or dominant reasons. They do this just to play around and have no harmful intentions so there is no reason to be afraid.

Humping
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Sniffing Butts
Imagine if humans beings met each other and the first thing they did was smell one another’s behind. Well, this is what dogs do and partly because of their impeccable sense of smell. They smell another dog to get to know them and become friends.

Sniffing Butts