Well, time to let the cat out of the bag or in this case the vixen and the cats. Usually all my friends whom I role play a lot with are actually all vixens or wolfs or a coyote breed, things amongst that sort. While I like to role play as a male lion, course once in a blue moon i'll go for the canine breed. The reason being it isn't a realistic role play for our characters but rather its a human who has a feral, anthro and human form, with some powers here and there or something to make them different. Lucian for example is actually the first lion character to have a lion female mate, while Typhon my greek character has a yellow vixen mate named Sparrow for his. And no where near height comparison too xD Other than that its a lovely thing to have so many people have so many combinations. And I love it, unless....
If its a realistic or semi realistic, please make it plausible. Only thing I will EVER say that its not okay, and I don't mean a Hyena and a Lion can't be together, nope. If a Lion and a Hyena make a kid in that rp and its suppose to be semi realistic, I'd want to hit them. Just because, how the heck would it survive, one and two, uhm...there's a hyena and lion offspring in the real world? Say what? So yeah, only rule i'd ever say for me really about roleplays with different specie couples.