Jack Russell Terriers are great climbers and diggers. Some have been known to climb trees. A fenced yard with a minimum of a 4’ fence is needed. Some JRTs have no problem scaling or jumping a 4’ fence – your dog should never be outside unsupervised. If your dog is a digger, lay some chicken or turkey wire on the ground extending 1 ½ - 2 feet inside the fencing, and either 6” outside or attached to the fence. Make sure the wire is flush with the ground and that there are no sharp ends exposed. Bury the wire with leaves or soil.
The most important safety rule for a young pup is to be sure he is always confined if unsupervised. Even if your house has been puppy-proofed, he will find something to get into. It is not safe for your dog to ride loose in a car – he should always be crated. See the section on crate training for more info. We recommend that you have 2 crates, one for the house and one for the car, to avoid having to move it in and out.