Poor Dewey - what a hard decision to make. But you definitely would be doing the right thing by cancelling. I'm glad that you were able to get some unbiased advice (since you were clearly getting very partisan advice from Aaron) before you gave your whole heart and soul to this pup. Imagine how heartbroken you would be if you brought him home, and then had to watch him suffer with a horrible illness or die.
Those poor dogs look miserable and unhealthy, it breaks my heart. And buying a pup from that breeder would just be promoting the suffering. Poor babies.

I can't decide between wanting to cry for them and wanting to beat the $#@% out of the person responsible for their condition . . . maybe both at the same time?