How to Discourage Dogs from Chasing Cats?

I had an old tom cat one time that hated dogs.
The neighbors had this huge old bull mastiff that stood at least 4' tall, the neighbor warned me that the dog hated cats.
I just took note of it, one day the dog wandered in my yard, I seen the cat fly around 20' in the air.
The last time I seen the dog it had a black cat attached to its rib cage, all 4 claws dug, the dog was whining like a baby running as fast as he could home.
The dog never came in my yard again.