1000% this. Another 10 or 20% would be helped with proper use of crate training (the dogs are scared and the crate can be their safe space). I actually have a

1000% this. Another 10 or 20% would be helped with proper use of crate training (the dogs are scared and the crate can be their safe space). I actually have a Parson Russell Terrier (AKC breed standard name for a jack) and while mine is easily in the lower half of energy, it was only because of some very extensive pre-purchase work to find a dog with the correct temperament.