By: Beverly Ulbrich, Guest Writer

Most people have heard that you should mess with a puppy’s food when he’s young to ensure he doesn’t growl at or bite you. But did you know that you need to keep doing this throughout your dog’s life?

You never know when you’ll need to grab something dangerous from your dog’s mouth, or when someone might try to pet your dog while he’s chewing on something. So you need to make sure your dog knows that it’s okay.

We’ve been bringing you her expert tips here at Yellow Dog Blog and now our training expert is the official trainer of San Francisco USPS mail carriers on how to deal with aggressive dogs.

Beverly Ulbrich visited the main mail-sorting facility March 21 to lead two talks to a group of postal carriers before they headed out on their daily routes.

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Beverly talked about how fear is the driving force for why dogs attack.