V.B.
No fence here, so I don't have a clue. (GSD)
Her favorite activities used to include chasing tennis balls and frisbees (and bonking a medium sized, soft, kick ball type ball back into the pool, like a seal when a swimmer would toss it in her direction). Unfortunately, she is older, and arthritis together with a recent bout of Old Dog Vestibular Disorder has made chasing and jumping and being around the pool not such good ideas. :/