New younger horse bullying our older pony

Answer 1

Hey bud its normal. They all do it, dogs cats, birds ect. They all are gonna do it, i once went to a pet store and there was a sheltie, a boggle, a cocker spaniel and an beagle. They all picked on the beagle biting and chewing on him and it was playfuly... I soon figured he was was older then the others sitting in the corner, depressed, alone, unloved and sad. Well there ya go bud! :)
~love and kisses always happy to help~