my puupy is around 16 weeks and she has recently displayed food/toy guarding (freeze, tail down, growling, upper lip lifting and biting), and growling/air snapping/nipping hands when she is asked to do something she doesnt want to do at that moment (e.g. being picked up, going to toilet etc).
She has bitten both myself and my partner and drawn blood when she had high value treat (or sometimes trash) in her mouth and thought it would be taken away from her when we approached too close. She is fine and relaxed with us around her and petting her during main meals because we feed her by hands and introduce hands in her bowl and petting at early age (she did growl and snap during main meals initially when we first got her and hence the hand feeding), however we did not pick up her guarding with treats at the time.
Her toy guarding is not as severe as with food, usually it is with the new toys in the first 10 to 20 minutes when she first has the toys and all she does is mild growling and walking away with the toy. She recently learned 'let go' so she is able to give me her toy when asked and followed with treats.
Please could anyone help me and provide advice in how to address/correct these behavioral issues? Thank u so much.