"It's highly likely that if there was filming going on, and I understand there was, that it would have ended up on the site," Robertson said, adding that Miller had posted other animal clips before.

"He just loved animals and he spent as much time as he could with them. He said it's amazing, just like being with your family cat or dog," Robertson said.

Randy Miller told The Associated Press in an emotional interview late Wednesday that he couldn't explain how a "simple routine" turned tragic. Rocky, who has performed in commercials and recently appeared in the Will Ferrell movie "Semi-Pro," was trained to wrestle with experienced handlers, he said.

People for the Ethical Treatment of Animals provided the news media with copies of federal inspection reports that noted some problems at the site in 2001, 2005 and 2007, but a spokeswoman for the U.S. Department of Agriculture called them "very minor issues" that were quickly corrected.

Examples included water troughs that were frozen over, a worn and stained cutting board for meat preparation and jagged edges on some plywood enclosures.

In its past four inspections, officials with the USDA's Animal and Plant Health Inspection Service found no non-compliances, said the spokeswoman, Jessica Milteer.

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Associated Press writer Raquel Maria Dillon in Los Angeles contributed to this report.