Hello everyone, I'm in desperate need of help with my Lurcher/Collie/whippet/deerhound. Think she is more Collie mixed, she is from a rescue centre. We have had her for over a year now. She is a clever dog and sits when she wants a treat and even gives her paw. Recently something has become worse though and that is when anyone leaves the house she turns into aggressive mode and goes for the person leaving, biting, jumping up but very aggressively, its not only confined to leaving the house but leaving a room also. She also gets very hyper when someone enters the house but not as aggressive. She barks at people walking down the driveway and gets quite frantic. At night she tends to get worse and is constantly barking at us. I need advice urgently as can't really afford a trainer and want to curb this and see what methods people suggest. I have tried the ignore approach but she still bites, a firm no but still doesn't work. All feedback much appreciated. Many Thanks.