Her first home was with a lady with mental health problems who kept about 10 dogs and cats too. She has scars on her face so was likely involved in fights. I believe the animals were left alone in the house for some time when the lady was sectioned, until the nurse contacted the RSPCA. The rescue Peggy came from had a group of three female Patterdales from this house who got on fine with each other but all have the same issues with dogs.
At the dog club she is pretty subdued and does everything I ask her to command wise, but if a dog gets close to her face she often snaps. She rarely makes physical contact though, and if she does it is just fur, she never causes any damage.
Usually in the park as soon she sees another dog the fur on her back stands up straight away and she is very agitated. She is worst if a dog is on a lead and she isn't. A few times when I have been caught by surprise, she has been off lead and tried to attack a dog that is on lead, but not outright trying to harm it, more like a boxer having little jabs then running round it barking.
What is strange is if we are on an enclosed path, say through some woods, and a dog passes us, she does nothing, I have even seen her let a dog sniff her. But once we have passed and the dog is a 100 yards or so in the other direction, she turns back and runs at it barking, then back to me, repeat until dog out of sight!
I am finding it hard to use the reward method, ie give her a goodie when another dog is around, because her behaviour is so bad I don't want to reward it. Also she often ignores the treat (and me) if there is a dog in sight. The dog can be miles away on the other side of the park, a little dot on the horizon, and she will be off barking at it. Today I kept her on lead every time we saw a dog, and it was like having a tasmanian devil on the end of my arm, she was much worse than if I let her do her running and barking thing. Also when I got the treats out the other dogs who were off lead tried to take them off me