Who is the little boy in trifexes commercial he that played on real steel?

You're likely thinking of Dakota Goyo, who played Max Kenton in the 2011 movie "Real Steel". He also starred in the 2012 film "The Amazing Spider-Man" and had a recurring role on the TV show "The Strain".

While Dakota Goyo has not been featured in any Trifexis commercials, it's understandable why you might confuse him with another young actor. His work in "Real Steel" made him a recognizable face for kids' movies around that time.

It's possible you're thinking of a different actor or commercial. If you can provide more details about the Trifexis commercial you're thinking of, I might be able to help you identify the actor!