I brought home a 5 month old kitten 2 weeks ago, and I have noticed that he has never meowed or made any kind of vocal sounds so far. He does purr a lot, but that's it for sound. My resident cat is very vocal, the complete opposite. He's gone through quite a bit where most normal cats would have made some sounds at some point, such as being brought home from rescue in the car for a good 15 minute ride, getting nails clipped-which he hated, was bullied a bit by resident cat in the beginning, and now they play together, but fairly rough sometimes. In general he's pretty comfortable and has warmed up very well to all of us, but not once has he made a vocal noise. Is there anything to be concerned about? My main concern is when the 2 cats are playing rough, him not letting anyone know that it's too rough or if the other cat is hurting him.