Hello, my son and I have a four month old pomeranian puppy. He was in charge of the training, I noticed he would get impatient when the puppy would not listen. He would spank her on the bottom or grab her suddenly and put her into her kennel, smack the top and yell no. She has this twitch that I never noticed untill after the incident where her head moved forward and back and her one or both eyes blink, not violent and does not affect any of her behaviour she is always happy and running around. I notice it comes on when we ask her to perform a command or she gets scalded. I spoke to my son and he knows not to be so impatient or rough anymore but I am worried about the twitch. Is it a sign of a brain or neurological problem or just anxiety/fear? Please help!