[gracielove]

A Jack Russell can be a much more powerful and aggressive dog than a Yorkie. Their bone structure is heavier as is the body type. Observe this "playing" and see who is winning. Is the Jack Russell the aggressor? Is the Jack Russell on your bed at night? It could very well be that your Yorkie is worn out by bedtime and maybe even a bit fearful. Maybe separate them a few times a day and control that rough housing. Yorkshire are fearless and full of energy but they were bred to take on small rodents, not a dog heavier than themselves. Jack Russell Terriers were bred to kill rats in barns while the Yorkie were used to go into walls and holes after mice. These genetic traits are deeply engrained. Terriers are energetic but they definitely are not all the same. Has your Yorkie ever fallen off the bed? I would definitely not let them wrestle on the bed. I would give the Yorkie first dibs on the bed and let the Jack Russell sleep in a warm soft kennel. I known that could be an issue but there is something really wrong with your Yorkie and it could continue to get worse and effect his personality.