Dog treats known as pizzle sticks or bully sticks, made from bull or steer penis tissue, were found to be packed with calories and some were contaminated with bacteria, according to a study led by veterinarian Lisa Freeman of Tufts University's Cummings School of Veterinary Medicine. "While calorie information isn't currently required on pet treats or most pet foods, these findings reinforce that veterinarians and pet owners need to be aware of pet treats like these bully sticks as a source of calories in a dog's diet," Dr. Freeman said. Bacteria found on the treats include Clostridium difficile, methicillin-resistant Staphylococcus aureus and E. coli.

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