We practiced manners (on leash) when people entered the house. When guest come into eat or visit we out them on place and they have to remain there until the guest call them over. We purposely make that wait to happen, we have to do this every time. We have found the dogs are like toddlers, you skip once and they will take that as an invitation to loose all manners! That saying "give and inch, they take a mile" must have been created because of shepherds...;-)
The chasing of cats....I can't give suggestions. Ours do fine with the cats, when they were puppy's we taught them to ignore the cats and would say leave it, it they paid to much attention to them. Leave it-command has saved us a lot of hassle. I am sure someone here can give you advice on this issue.
As far as the toy issues and aggression with each other....they sound (in my opinion) excited at times when they fight for attention, bored and frustrated the other times. I am NO expert....and have only had ours pups for a year. But when Millie is really excited, all drives up....she will jump on miles. We sometimes leave the long line on so we can correct her if she get to excited. When she was injured a couple of weeks ago, she could not open her mouth and get the ball! She was so frustrated. She has tons if ball drive and the fact that she could chase it, but not pick it up....she would snarl and growl at miles but was unable to bite him. We avoided allowing them to play ball for the time she was injured after that because we did not want her frustration becoming acceptable behavior. Other times we have noticed them frustrated is when they are bored and trapped....rainy days leave us very trapped, we go out for potty but can't play games is downpours. They get very bored and frustrated just like kids do. We have to keep them engaged with games, indoor tracking and puzzles. Again....others on her may have better ideas about what is going on! I can only tell you what we as owners have faced...I am not an expert, just dog owner that notices how much like kids these dogs are...I kind of apply what I have learned with parenting to the breed. GOOD LUCK. I hope someone gives you helpful advice and you can all live together peacefully indoors together!
Sent from Petguide.com Free App