My Little Pony: Friendship Is Magic episode 5 - Griffon The Brush Off.
Pinkie Pie and Rainbow Dash love pranking, but when an old friend of Rainbow's, Gilda the Griffon, rolls in, the pranks start to become dangerous and cruel. When everyone is convinced that Pinkie is jealous, will Rainbow choose her old friend over her new ones?
I do not own this, all credit goes to Hasbro entertainment and its affiliates.