Roddy does this sometimes too Lori, just today he was out with another boxer playing nicely when a staffie x came over and wanted to join in, for a short while there was a bit of barking and a bit of tension but then they all decided they were friends and ran around for ages together. Later on, the other boxer lay on the grass and wanted to play with the staffie from the ground. They looked like they were playing nicely together - mouthing and pawing at each other, but Roddy didn't think so, he went barging in and jumped on top of the staffie trying to dominate it. Me and the staffie owner had to pull him off.
It would be really interesting to know why some dogs are more reactive like this or whether there is infact something going on in the dogs body language/behaviour that dogs like Roddy and Wally pick up on that triggers it off......
Anyway, a break from the place sounds like a good idea to me.
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