How can I help my female 2yr old scottish terrier stop being so defensive toward strangers?

To avoid a really, really long answer here, go get yourself the Cesar Milan-Dog Whisperer book. He has some really good methods for dealing with these issues. Your library may have a copy.

Use a chain collar and a standard 6 or 8 foot leash (not a retractable one) for going out on walks.

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