I am not currently using a .270 on yotes, but i have in the past. I just bought a Remington .223 so that will be my new yote gun. A .270 is an all around good gun, but may be a little much for the typical coyote. If you do not care about the damage to the dog, i would go ahead and shoot. If you are looking to save any coyotes for fur, i would go with a smaller gun (.204, .223 or 22-250).