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I just adopted a Jack Russel who is the biggest MOOSH=lover boy! You go to pet him he roles on his back to be pet on his belly....I have him 3 weeks and maybe have heard him bark 3 times which are very soft. I have heard the are hyper dogs thou this one is just a lover...hence we named him Romeo!Anyway anything we should be foncernef about if he doesn't bark? I have a seven year old lab who barks at the door the bell and cars ...when Romeo hears him bark he sometimes runs with him or sometimes hides under something.