one of the neglected pooches that end up at sam's shelter is a 6-month old cane corso, also known as an italian mastiff, a breed some people refer to as "a pit bull on steroids." the big canine is quickly deemed too aggressive to stay at the shelter. so sam takes him home and names him columbo, after the rumpled, trench-coat-wearing detective played by peter falk. >> he adored columbo, clearly. i think he was like an offspring almost. he was like a son. >> a son with a nasty disposition. within months, columbo attacks staff members on the simon estate. there are as many as eight biting incidents. he even goes after sam's buddy, howard stern. >> ok, guys, go play! [ dogs barking ] >> so, in 2011, sam contacts tyson kilmer, who has a reputation for working with dangerous breeds. his hollywood clientele includes rob lowe and mike tyson, but none impresses him like sam simon. >> the first meeting he had with sam, tyson came back and went, "i met my hero. i met a guy that's doing way more than i am with animals." it was a bromance. >> alison kilmer is tyson's wife. >> was it more than jus