have a 1 and a half yr old Boxer mix, Mixed with what we are unsure. Very active dog. She has been staying outside in 2 acre fenced yard while I go to work now for the past few months. When I get home after being gone about 8 hrs she is very tired. I also have a 4 yr old chihuahua. They are best friends, well use to be. Long story short, the other day went outside with the chi who stays in to greet Cleo(boxer mix) after work the chihuahua started to eat some food in a bowl outside, She lit him up growling charged him smashed him agaisnt the slider I didnt react as I should have yelled and pulled her off, the chihuahua was in her mouth and she shook him, Removed her off the deck. Check the chi and no apparent injuries. A day later out cat walking through the yard and she charged her growling, cat climbed a tree. Now today the neighbors with 2 chihuahua came to our door. (they have never met face to face just through a fence) Made cleo sit as I answered the door, She burst through the door and attacked the neighbors chihuahua as well. She was not hurt, but my pride as a pet owner/Mom was. I feel I have trained her well, very good manors, and has never been like this around other dogs before until recently. She was just at the vet 3 months ago and was healthy as could be.
Please help we are planning to have children soon, and am scared she will attack them. She never has attacked a sm child before and has been around a few.
Your girl is a bulldog breed and has reached maturity... the time when issues such as dog aggression and dog reactiveness can begin to occur. Realize too, that small animals such as cats and small dogs can cause a prey type reaction to kick in and the fact that most bullbreeds were bred as hunters at one time means they can be hardwired to be preydriven.
I recommened that you do not allow food, treats, toys be available to both of your dogs together as they can trigger fights or cause possesiveness and resource guarding issues. I also recommend that you go back to basics with your dogs on obedience work and maybe wear your boxer out before allowing the dogs to interact. It goes without saying that these two should not ever be together unsupervised.
Lastly, if people come to your door with other animals, it would be best to put your boxer up to avoid any further attacks.
So... to sum it all up... obedience training and giving your boxer more excercise and stimulation. Dogs left alone for so many hours get bored and build up pent up energy and frustration... my motto is a tied bulldog is a good bulldog.