How would ya really know if an animal is gay?
My mom had dogs, raised and sold puppies (purebred, AKC, good quality). I would guess I've been involved with upwards of 200 breeding dogs over my life.
ONE was gay. She purely hated males, would attack them regardless of how, um, "ready" she was. Put her in with a female, she'd act like a male. We had her spayed and gave her to a pet home.
We also had one dog that had her first litter of pups (at another place) in a pen with way too many dogs all together. She ate all her first litter, and really thought that was the right thing to do with pups. Mom got so desperate that she'd take her pups the second they were born, and would hold her down every 2 hours so they could nurse...and even at that, she managed to kill one. We had her spayed, also.
In both cases, about 1 in 200...if you get my point.