I was looking at custom skins and saw this amazing sleek dog/fox looking beast species. Is this a rare species? where does one get them? 

(also a little off toppic but, can we breed two different species of the same type of animal together? like two mammals for example?)

dk if it's too late to answer this, but here goes:

I thiiiiink you're referring to a lykos? You can get eggs during tundra, but the best way would be to breed/buy them. Is it the one with the hedgehog looking mane? Or is it something that looks different from the others of its species because it's a custom skin?

No, you can't breed different species together (it would be cool though... *starts speculating wildly*)