Both pets must have the same breeding class in order to breed. You assign breeding classes when you first make the pet. So for example, all pets with "Small" for their breeding class can breed with one another.
To get different types of pets out of breeding, go to your breeding settings in your ACP and enable Advanced breeding. Make the breed adopt like you would a normal creature, but select "available from promo code use only" option when you get to the availability section. Then create the new type of pet by going under your Breeding tab and clicking the "Create New Breed Adopt".
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