I agree that the da of the apbt could be a problem.

That is why I would have the apbt further down in the pedigree. Also, I would start with one that has a lower level of da.

Then I would also choose an F1 pup that does not have any or very little da. But, I would hope to keep ALL of the other traits of the apbt.

One of my male apbt has VERY little da. Actually, a strange dog can come up to him and he would casually just check him out. On the other hand, his littermate that I have is an ABSOLUTE monster when it comes to anything on four legs. Thus I would use the male with the low da in this breeding "recipe". Of course there is the chance that he passes on a very high da on to all of his progeny.

But with the Mal blood and the Ca blood (which will be the most dominant blood) in this recipe; theoretically, the end result would not be  da. Thus will be able to work in a pack of at least 4.

AGAIN: ALL OF THIS IS HYPOTHETICAL.