I have to disagree with rajeshshri. Your dog believes that he outranks your husband, that is why he is growling at him. A dog that knows it's place does not growl at it's owners. Talking softly to him will only make him even more sure that he can boss your husband.
Your husband needs to practice behaving assertively around the dog, speaking (if at all) in a confident and firm way. Watch "the dog whisperer" or go to his website for more tips.
Your husband needs to practice behaving assertively around the dog, speaking (if at all) in a confident and firm way. Watch "the dog whisperer" or go to his website for more tips.