Why does my pet dog only wants to have male dogs around?

I noticed my pet dog snoppy only plays with male dogs only, he actually runs the female dogs, I mean he chases them away, and humps his male companions, does this means he is gay? Are there gay animals, please put my mind at ease here.
Anyone out there ever had this experience with any pet. Thanks.

when male dogs do that, they are merely showing dominance

nothing to do with being gay

How To, Batman! – How to Pet a Dog

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