Quote Originally Posted by angelbow20
Both of the dogs we have that had border collie in them were more aggressive towards other animals then any of our other dogs. borders seem to be more protective and such than alot of breeds but you would need make sure shes around other dogs.
Actually, that is true to a certain extent. Due to their intense herding background, Borders have drastically different body language compared to other breeds, mainly Labradors. This is why some Borders have a lot of conflict with Labradors which can often lead to fear aggression, a rather common problem in BCs. Of course, there are many factors including socialization, whether the dog is intact or not, natural breed characteristics, etc.

I recommend The Cautious Canine by Patricia McConnell. Her book will provide you a step-by-step guide to desensitization. However, your dog may require you to go sit in a park every single day for weeks at a time to successfully desensitize her and "get rid" of her aggression.

In the meantime, I agree that socialization is key. Pat McConnell will provide you with this same step-by-step guide but here's my breakdown of it:

- Sit down in a quiet place with your dog on a relatively loose leash. Make her sit as well. Treat her whenever she's acting calm.
- Have a man (your friend or uncle) walk towards your dog but stay about 10 feet away. If your dog starts overreacting, turn her attention back to you and stop the session. This is her breaking point. Don't push it.
- Eventually, the man will inch closer and closer to the point where your dog will tolerate him standing right next to her. If you did this right, she will be calm throughout this session. If she starts getting nervous to the point where you can't get her attention, you've crossed the line. Stop and don't go any further.
- When your dog can tolerate the man standing NEXT to her (not face to face), ask the man to give your dog a treat. He should have had a handful of treats in his pocket beforehand.
- The man will drop the treat on the floor. If your dog eats it, stop the session and congratulate yourself.

Eventually, your dog will allow a man to waltz up to her and she will take the treat directly from the man's hand. She will connect males to positive attention and, in essence, you will have "fixed" her aggression. Good Luck!

Edit to add: This is a prototype. You can follow these steps to desensitize her to male dogs, as well.