Unfortunatley i have bulleted a few k-9' s in the last 5 years. The farm dogs stray wild for miles around my area.... When you see a dog in a chase, its not gunna be chasing anymore. But, i have a dog near my house outside, and has never had any problem w/ the deer. While deer are feeding he gets out of his house and walks around, even the noise of the chain doesnt bother them, dont know what your problem could be.