You don't. Alchemy is a false science. Even at the time when they thought there was such a thing as alchemy, they had no clue what genetics was. So they probably didn't know either, and even if alchemy was real and you managed to figure how to engineer a cat from like a piece of lead or something you would probably be hanged as a witch. So there really is no way.
mink+chinchilla
Kangaroo and guppy
Ant + Scorpionfish
Android+bee
Dwarf+segacious
Raven + dove
Bear + snail
Ant + Eagle
tiger + pig
Horse + manul
Bat+alien
starfish + lion