any advice?

[waldfamily]

We have had our two adopted three year old Newfs for about a week now.  They are the sweetest things to everyone they have met... all except my seven year old son.   They are fine if he is ignoring him, but for some reason if they are laying down and he starts petting them they growl.  They don't do it to anyone else except him.  It really makes me nervous.  Any advice on what to do???


Thanks-
Hilary