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Most of us know by now that having a dog can be good for your health: Studies show it may help lower your blood pressure and relieve stress. But what kind of effect are you having on your pet? Of course she benefits from your love and affection (as well as your constant reassurance that she's such a good girl! such a good girl!), but you may also be doing things that aren't so great for her:

1. Sharing people food that even people should eat in moderation.

"Pizza crusts and ice cream are the biggest threats pets face," says Ernie Ward, a North Carolina veterinarian who founded the Association for Pet Obesity Prevention (APOP). Junk food can cause Mr. Wiggles to pile on the pounds, which is one reason that an estimated 54 percent of dogs are overweight or obese, according to APOP. Extra weight can put your dog at risk for arthritis, heart and kidney disease, diabetes, cancer, and a shorter life-span.

Pet Rx: Limit your dog's snacking, and if you do want to share some human treats, make sure they're healthy—Ward suggests baby carrots, celery, or zucchini.