They told me a story of how their neighbors dogs jumped over the fence into their yard and killed their small dog and almost killed their German Shepherd. (downtowndogrescue.org)
If well trained, the dog will think better of it and not jump over the fence even when youre away. (dogobedienceadvice.com)
He may have lived in a backyard and learned to dig out or jump over the fence on a routine basis. (grrmf.org)