Very selective deer, they know you have murderous intent on occasions, sheep dogs not generally so much. Either that or they don't like your aftershave.My park fallow are quite fascinated by my dogs, and when the dogs are loose on the yard the deer will sometimes come right down to the gate for a closer look. On one occasion a pricket actually touched noses with one of the collies through the gate. Yet if I approach the gate the deer are gone in a flash.