why do female dogs hump other dogs - PETS
Q: Despite being female and neutered, my dog constantly humps other dogs and even visitors’ legs. It’s so embarrassing. What can I do about it?
Understanding the Context
A: Dogs get up to all kinds of cringe-y nonsense: ... I receive numerous emails asking something like, "Why does my dog hump other dogs?" Sometimes people ask, "Why does my dog hump his water bowl, her favorite toy, or my or other peoples' legs?" or "Why ... Why is a just a rather odd wh -word. Its distribution is very limited -- it can only have the word reason as its antecedent, and since it's never the subject it's always deletable.
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Key Insights
Consequently it behaves strangely, as you and others point out.