hello cat lovers. We recently adopted a much younger meow meow and the introduction process was as wrong as you can get. The person who was fostering him needed him adopted ASAP. Long story short he was delivered and plopped in the floor with my other cat standing right there. We were not set up yet for his arrival. Needless to say they don’t get along. It’s mostly that the newest kitty is 4 and my older kitty is 17 and is not in the mood to play. My eldest doesn’t act 17 but his body def shows signs. He is slender and has arthritis and so it’s now become a major concern that Carl ( new cat) might really hurt Zander ( old cat) not meaning to but by knocking him down etc. in hind site we should have thought more about the age difference but I guess it was wishful thinking. So my question is will redoing the into the right way help at all if it’s just a fact Carl wants to play? Albeit I’m not a behaviorist so it could also be territorial issues because they are both male. However, he doesn’t chase him out of the room or go after his food he just stalks him and bops him on the back or tail. There’s been no fur flying brawl or anything. Also, if we do ahead with the separation the only way logicsticslly to put up a barrier would cut Carl off from the living room where most of the people hang out and I don’t want him to be lonely. Any advice welcome