Cindy's Answer
It's very difficult to work on reactive behavior unless you can control the dog's environment at all times. Every time she is reactive in the garden, you are correct, it's reinforcing the behavior you do not want.
When I am working with a dog like this, I won't put them outside without my direct supervision and a leash or long line on them. I know it isn't ideal or easy, but it's what dogs like this need to help them change their behavior.
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