[SirTeddykins]

I think you're perhaps attaching too much emotion to the growling and barking. It may be more helpful to step back and review the situation objectively i.e. does the dog feel cornered in some way? trying to draw attention to something i.e. itself or its needs? is it afraid for some reason? is it establishing boundaries?

All of the above are perfectly normal dog behaviors. I would suggest that you talk to a behaviorist who can help you analyze and correct the behavior, should that be required, since I know that will go a long way towards harmony, compassion and training. Much better than emotion attached to speculation.

In the dogs eyes, it doesn't matter who you bought it for...it belongs to itself as its own being. I don't believe any of the behavior is personal but, rather, miscommunication.

RSPCA will often recommend behaviorists they use to ensure dogs are adoptable and can sometimes offer referral discounts. Alternatively, ask your vet for a recommendation.

Good luck.