Earlier this year, Crosby was called to McKeesport, Pa. after a two-day-old infant was fatally mauled. The baby's mother had left the boy in a carrier. A husky named Helo and a pit bull were loose in the house and two other dogs were in the basement. Prosecutors thought Helo had killed the baby and a judge ruled that the dog should be put down, but the man who adopted the dog after the attack appealed.

Crosby found that investigators seized Helo and the pit bull but didn't look at the behavior of the other two dogs. He added that when he evaluated Helo, the dog was was "personable, friendly and non-threatening."

Pam Amicarella, the attorney representing Helo, said they trusted Crosby's assessment and would also have put the dog to sleep if he had recommended it. Instead, Helo was sent to live at an animal sancturary.

"If he had determined the dog was aggressive or dangerous, we agreed the dog would be put down," she said. "He was able, because of his background, to put together an opinion of what had occurred at the scene."

The other three dogs are still living in the community, which dismays Crosby because those dogs could have been involved in the attack.

"This case shows that you can't make assumptions and that you have to check everything carefully," he said. "Hopefully these other three dogs that are unaccounted for won't hurt anyone else."