My spoo Princess (8 years old) has always been more aggressive around other dogs than I would like her to be. She has the "alpha" mentality and will always growl and even bully other dogs. This usually only happens with dogs she is unfamiliar with. Most dogs seem to just back off, especially younger pups. But occasionally she runs into a dog with a similar temperament and then things can get ugly. Because of this I take them almost exclusively to areas where there are no other dogs, not so easy to find anymore. What would you suggest to quell this behavior?