Adopt some donkeys. Turn them loose among the cattle.
The BLM down here often go out and round up Donkeys and people can adopt them.
Farmers up were I come from did just that and they havent lost one cow/calf since. Before, they were losing up to 30 head a year from Wolves. The wolves will hang around if they can grab a cow and will send the pups in to learn how to kill. Wolves will kill for the fun of it.
Donkeys will kill coyotes and wolves if they get hold of them.