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TUCSON - Did you know that almost half of all U.S. household have a dog? That's about 73 million homes! Of course, a dog has to eat. Last year, we spent more than $18 billion on dog food.

With so many different choices, how do you know what you're buying is good for your dog?

On today's "Pet Vet" on News 4 at 4, Dr. Randy Aronson stopped by to help you figure that out.

From 2002 to 2009, Dr. Aronson says that sales of organic pet food increased ten times that of conventional pet food sales, according to the Organic Trade Association.

Dr. Aronson found a source that comprised a list of the three most healthy and (somewhat) affordable organic dog foods:

1. Newman's Own Organics makes organic dog food. A 25-lb bag retails for $39.99. According to Newman's Own Organics reps the organic dog food line sales are expected to hit $20 million.

2. Natura Pet Products is the only organic dog food line made with almost all organic ingredients. In fact, 95% of the ingredients in their Karma line of organic dog food is organic. Therefore, Natura Pet Products Karma line is currently the only organic dog food line with the USDA certification seal on the bag.

3. Castor & Pollux Pet Works is a pet food company based in Portland Oregon. In 2003, Castor & Pollux Pet Works came out with their green and organic line of dog food called Organix. A 15-lb bag of Organix dog food retails for $27.99.