I don't want this to be turned into a heated debate, but I really think that before it is suggested that Charlie has a biting problem, or worse, Rage Syndrome, that his behaviour is fully assessed - if it is resource guarding and Phil is worried about his young daughter than he is completely justified in thinking that perhaps a different home as he's suggested may be more appropriate for Charlie.
None of us can see how Charlie is reacting, and imho Phil is really courageous by wanting to re-home him in this way.
I agree with Penny, Rachel and Mark wholeheartedly.