We have four inside dogs. Our GS mix is constantly guarding the food bowls and growls at the other dogs when they walk by. What should we do?

We have four indoor dogs- two male and two female. They're all mature. The female german shepard mix is constantly guarding the food bowls and growling at the others when they walk by. This, we believe, is the cause of the fights. The little male terrier never gets involved but the beagle mix and the retriever mix will fight her.

Before we pay any more to the vet, what should we do to stop the food guarding? We've placed three bowls of dry food in three separate places in the house. We keep the bowls full.

Your advice will save us money and nerves.

Thanks in Advance,
Mike and Karen