I took Bella to her dog training class yesterday. It was her second class and she was winding herself up as there was a GSD there she'd never met before and couldn't keep away from it, at one point they were barking at each other.
When it came to walking around the training area (with other large dogs) she got extreemly agitated and started jumping up at the GSD and me, she was also biting her lead and nipping at me. I have been trying to get her to not bite by shouting 'OUCH!' whenever it happens and ignoring her but when she does it on the lead it's harder as I can't just drop the lead. She managed to bite me quite painfully on the second walk around, it didn't puncture the skin but I really wanted to wallop her (I didn't). The trainer suggested giving her a huge tug on her training collar but when she has hold of the lead in her jaws it's quite hard, she just thinks it's time for tug-of-war. This is something she also does on walks but she's never bitten so hard before. I use a rope lead that's quite thick, but not tug toy thick.
Can anyone offer any ideas on stopping this behaviour? My hand is still a bit numb over 12 hours later and more than anything it's embarrassing as hell when everyone else's dog can behave itself.