My girl sometimes crowds too.
Here are a few things I do, they seem to work for my dog most of the time.
The first thing I like to do when she first starts to crowd is change the pace from a walk to a jog, or a fast walk. I change paces abruptly and spontaneously, this is personal choice... It really seems to work for me. Once we have jogged around for a bit I decrease the pace back to a walk and reward after a good heel.
If the pace change doesn't work, I turn into her...often.
This is when her crowding is really bad...
I just keep doing random left turns, so she has to be on her toes....no time to crowd.
It really works well for me, especially after all the pace changes, she is usually very alert and attentive at this point.
Some people say to just "walk into the dog" or "throw out your knee", but I kind of find that lazy....
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