It is entirely possible to be allergic to some dogs and not others, I would just hate to see the family go through a string of dogs trying to find one he's not allergic to and I think if he is that allergic they are better off just keeping the one dog the already have that he can deal with and not keep getting others that might cause the same reaction as Max. Then what happens to all those dogs if he IS allergic? That's personally for me why I suggested they just don't get any other dogs right now.