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With puppies, when they begin to demonstrate some defensive behavior such as barking/growling at strangers, etc, I start to control it immediately.
I encourage when the response is warranted. I pet, praise, and use the key word I use to alert the dog. After a few seconds, I interrupt the dog, discourage the behavior, and distract the dog, using my command of "that will do" which means stop what you are doing right now.
If the response is NOT warranted, I do the interrupt, discourage, distract procedure, also with "that will do".
This helps me to end up with a dog who understands an alert and a cease command.
I encourage when the response is warranted. I pet, praise, and use the key word I use to alert the dog. After a few seconds, I interrupt the dog, discourage the behavior, and distract the dog, using my command of "that will do" which means stop what you are doing right now.
If the response is NOT warranted, I do the interrupt, discourage, distract procedure, also with "that will do".
This helps me to end up with a dog who understands an alert and a cease command.