I have a female bulmastiff who is very aggressive with other dogs (and she will kill cats if she can get to them). Even though her tail is wagging when we see and approach other dogs, the minute they get close enough, she will attack.

 Any suggestions, other than stay away from other animals? I'd love for her to be 'normal' and be able to go to dog parks.

 Thanks, Mike

It sounds like you could use some behavior lessons so when you give her commands like stay or sit she listens.  Look into getting her trained professionally. I am sure there are trainers in your area.

Hope this works out for you.

Remember that patient is a virtue.  So, don't be so let go your pet...

I watched Geographic  channel a month ago and tail wagging in dogs have different meaning I guess it tells their behavior...Dogs are aggressive in nature so proper training will tamed them...

well you should walk around with your dog..then if your dog sees either cat or other dog you should avoid it..