recently my Mom gave me a 3wk old baby chihuahua, the mother for what ever reason was trying to hurt it ,so the owners gave him away before he was old enough,i have bottle fed him and he is over 4 wks and is looking very healthy .My problem is sometimes when we go to pick him up he becomes very aggressive and growls ,he acts as if where trying to hurt him and is very defensive , I'm not sure if this has something to do with the mom trying to hurt him?what can i do to stop this and will taping him on the nose and telling him no work ,please help if you can,thank you?Tami

Optional Information:
Age: <1; Male; Breed: chihuahua

Already Tried:
taping his nose