Friendly nip or something to be corrected?
So, my horse that I have had for around three - four months has always given me a little nip on the leg when I put his halter on, not one that hurts by any means! I don't give him treats when he's in the paddock (or when I get him - he is in with 5 other horses, does not really end well ). He has an urge to do this almost, If I don't let him do it in the paddock he will do it when I'm putting the bridle on. Its never amounted to any dangerous behaviour, I think its something he used to do with his old owner. Should I stop this behaviour from progressing? Does anyone have horses who do this too?
I don't mind it, just want an opinion to whether its worth stopping this behaviour although i'm not that bothered by it (His manners are fantastic otherwise)