Great horned owls, northern goshawks, and red-tailed hawks are three of the most common birds-of-prey to lash at small dogs and cats, typically those under 20 pounds. ... And Garber notes that making yourself larger than the bird and shouting at it will intimidate the animal should it prepare to strike. read more
Red Tailed Hawk Facts and Information Buteo jamaicensis Introduction. The Red Tailed Hawk is a bird of prey. It is often referred to as the Chicken Hawk. They range in size from 1.5 to 3 ½ pounds. They range in length from 18 to 26 inches. They feature a wingspan that ranges from 43 to 57 inches. read more
I wouldnot worry about a red-tail taking your westhighland terrier it's too big, it would be likened to it eating a large raccoon. Too much energy would need ot be expelled byt the raptor - i'd let your dog roam as free as you are comfortable. If you had said toy yorkie or toy Chihuahua then I;d worry, but not a westie or cairne. read more