I have a 3 yr old male cat and all he does is sit and look out the window watching the other cats outside. I am debating on getting him a companion. The situation is my neighbor had 3 kittens that was outside for last year and on occasions I would let them in my house and visit with my cat, he would play with them for a bit than hold them by the neck until I would pick them up and place them outside. Now they have been surrendered to our local cat sanctuary, and my cat seems to be looking for them, I am thinking about adopting one of them. would I still have to do the intruduction process or is it not a good idea getting one. I figured it may be easier seince they know each other. Is it normal for a cat to bit at the neck of a newbee?