Dog trampled by brumby. Naughty dogs chasing horses. Henry and the Brumbies Part I

The dog wasn't hurt. He was lucky and the horse taught him a lesson. I've had difficulty stopping him from chasing the horses. He's only 10 months old. Luckily horses are not nasty, she just wanted him to stop harassing them and she taught him a better lesson than I could.
The other dog, Bundy is lucky he wasn't kicked.
You can see here, he has learnt his lesson https://youtu.be/Q22aDC8c7pE