I think, you should be able to choose your design, on a cat/dog. this would give people a chance to find the one they like. For example, if you wanted a grey tabby cat you can just select a grey tabby cat. or, if you wanted a great Dane dog you could just select it, and it would be yours. that is why, i think i should ba able to select what cat/dog you get.
*Ps. Also, to go along with this please add more dog types!*