Dogs meeting or attempting to meet on the leash can sometimes not be good as they pull forward straight towards each other rather than going to each others sides or nose to tail, like the dog you encountered was doing, this can be seen as a direct challenge and by the sounds of it Alvin accepted the challenge. How were your emotions? Were you worried, afraid, annoyed? Think back to how you were feeling at the time and then with the combination of the lunging forward you might be able to work out why Alvin took offence.
if your GSD is eating and eating and eating and losing weight - please consider testing for EPI.
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