Our other Aussie would grab the gray squirrels. While the squirrel was describing the foot and back of the triangle across the ground and then up the trunk, the dog was making the hypotenuse.My Border Collies get after the squirrels and it’s a big game with them. They will tree one and then lay down under the tree for a while just to aggravate them. I’ve never seen them kill one or found any remains. It could happen one day. I hope.