Hello, after some advice. We have been asked to re-home a 6 month old Jack Russel with our 10 year old Jack. The concern is the pup hasn’t got on with another dog in its current home. But...... the pup hasn’t been trained, is kept in a crate most of the day and is a bitch with a bitch. My dog is a male and we’ll trained but don’t want to take a new dog in and then move it on again if forced to. Any advice would be great.