Rushing, Barking, And Occasional Nipping

We recently adopted a 4-year old Miniature Aussie from a shelter. She was initially with a breeder and we are her third owners. Something has been missed in her socialization. She is well-behaved in the house, has good recall and is a smart and loveable dog. However, although we have her on-leash behaviour pretty much under control, despite what we were told at the shelter, she has a high prey drive and unpredictably rushes, barking madly at approaching people and dogs and on occasion jumps and nips.

We let her off leash on the trails because she needs the exercise but this behaviour gets us into trouble and we are afraid she may actually bite someone. What to do? We even looked at muzzles today but she hates it and it is only necessary very occasionally.

Any training tips would be much appreciated. We have hired a trainer but have not made any progress with this particular behaviour.

Thank you, Valerie

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