10. Don't repeat commands Your goal is to make your dog react to your command articulated only once. When you repeat a command several times and in the end your dog obeys it, this reinforces exactly this kind of behavior. So it would be required for you to say "sit" multiple times before your dog actually sits every time because you trained it that way.
Try to present commands and tricks as a fun activity while using treats and praise. Switch locations often to keep it fun for the dog. If you know that your dog knows the trick but fails to respond to your command, try to look it in the eye and take a step forward. After your dog complies, praise and/or treat.
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