If you enter a BG while on a flying mount and have a pet then when you exit your pet will still accompany you even tho you are flying. The pet will fall to the ground below you and will aggro any mobs in the area. In order to make the pet disappear you have to land, dismount and then re-mount your flying mount.

You can fly out of range of the pet and you will get your shard back but it means having to re-summon the pet. Not a huge bug but nonetheless can be annoying. A fix would be appreciated. Thank you.

Thanks for the report, we'll look into this.