I made a post around four months ago now on here about recall training for my then-new rescue GSD, a four (almost five) year old female. Since then made a lot of progress and she's spot on now with recall and in general really well behaved.
I found out a month after she came to me that she was used as a guard dog for 2 years of her life and it does show sometimes - usually she's been able to identify when someone walking towards us on the street at night looks a bit dodgy, she'll go alert and sometimes bark but never anything more, though I do tell her "No" when she does it to break her habit.
I have a feeling this is part of my problem, though. On the local park there's always a lot of other dogs and she mostly keeps herself to herself with an occasional little run around or a quick sniff of a dog she's never met before, about a two months ago we ran into a guy with two GSD's and I let her run up for a sniff when we were a few feet away and they started fighting.
Since then her and the same dog just don't like eachother one bit. I keep her on the lead when I see him on the park and he does the same - fine, no problems. I was on the park a few weeks later and a dog jumped on her back which she doesn't like and she gave the dog a quick bite rather than a warning bark, I put her back on the lead and said sorry to the owner but he didn't really mind much as she didn't hurt him. Shortly after I let her off again (at his request, his dog was keeping to himself) and they were fine.
I've met that same dog a few times since with NO problems but today I was again on the same park and as soon as this dog comes on she sees the dog running towards her and the group of 5-6 dogs we were with and she attacks him pretty aggressively. Embarrassed I put her back on the lead, apologised and left the park.
Obviously I'm not going to let her off again for a while because I need to sort this out before another dog or her gets seriously hurt. I've made an appointment with a behaviorist for three weeks away (earliest appointment they had) but for now does anyone have any ideas on what I can myself?
Apart from these couple incidents she's the softest dog you can imagine and very obedient, even when she was "attacking" this dog when I said stop she stopped, unfortunately I just didn't realise she was running at him to fight until it was too late.
Sorry for going on about everything so much!