This video (2 parts) goes over most of the morph combos that shouldn't be produced.
Basically if you are breeding a combo that has been produced before chances are you will be able to find out (google search or here on BP.net) if it will end badly or not. If you are breeding a new combo it is impossible to tell for sure. All you can go by is how the morphs that you are pairing do when combined to others.
Keep in mind that ANY pairing has the potential to produce animals that are deformed or fail to thrive. It is something that all animal breeders need to be prepaired for.
Part 1
http://www.youtube.com/watch?v=uStCA...e_gdata_player
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