We recently adopted a 2 yr old rescue Rottie and so far everything is going well, exceptfor him getting along with our cat. We can't let him go around the cat, and when we let him slowly get closer and start to stiff, he lunges at it. He hasn't aggressively tried to bite it, but I think he might.Our cat is great around dogs, and doesn'ttry to run, so there is no chasing going on. Any tips for this???? Thanks in advance!