I have an 8 week old Samoyed. I know that is is normal for a puppy to nip and to bite, but when I tell him not to do something, such as chew wires or eat his puppy pad he starts to bark and growl at me and lunges forward to bite my arms/hands/legs/feet anything he can get at really. He doesn't just nibble on my arms but really sinks his teeth in to me. I try and replace the chewing of my body parts with a chew toy of his which will keep him occupied for a few seconds, until I move and then the focus is back on to me, I have tried to ignore this behaviour and withdraw play but he will just follow me and bite at my feet until i'm gone and then he will cry for me to come back. Any advice?