My nan could be getting a puppy read on for details?

we have a 3 yr old jack and a 10 month old labby our jack (sam) was 2 1/2 when we got labby(buster) and sam was not too happy about it at first he would snarl and growl at him but we kept telling him no and making sure he got the same attention as before.now they are best of friends.they are both ty and buster is mad but we let them run in the garden and they play together gr8.good luck.