Photos: Russell terrier Macho declared fastest dog baserunner at Dodger Stadium Lucy Pet's Russell terrier, Macho, sits with his plaque from Guinness World Records after setting the world record for fastest time for a dog to run the bases. Macho set the record with a time of 21.06 seconds Friday, Sept. 24, 2021, at Dodger Stadium. (Hans Gutknecht/MediaNews Group/Los Angeles Daily News via Getty Images)
Photos: Russell terrier Macho declared fastest dog baserunner at Dodger Stadium Macho, a 5-year-old Russell terrier, relaxes in the dugout after practicing at the Conejo Creek baseball diamond in Thousand Oaks for his attempt to set the world record for the fastest dog to run the bases at a Major League Baseball stadium. (Hans Gutknecht/MediaNews Group/Los Angeles Daily News via Getty Images)
Photos: Russell terrier Macho declared fastest dog baserunner at Dodger Stadium Lucy Pet's Russell terrier, Macho, sits with his plaque from Guinness World Records after setting the world record for fastest time for a dog to run the bases. Macho set the record with a time of 21.06 seconds Friday, Sept. 24, 2021, at Dodger Stadium. (Hans Gutknecht/MediaNews Group/Los Angeles Daily News via Getty Images)
Photos: Russell terrier Macho declared fastest dog baserunner at Dodger Stadium Macho, a 5-year-old Russell terrier, relaxes in the dugout after practicing at the Conejo Creek baseball diamond in Thousand Oaks for his attempt to set the world record for the fastest dog to run the bases at a Major League Baseball stadium. (Hans Gutknecht/MediaNews Group/Los Angeles Daily News via Getty Images)
Photos: Russell terrier Macho declared fastest dog baserunner at Dodger Stadium Dog trainer Lori Signs and Lucy Pet Products President Joey Herrick hold Macho, a 5-year-old Russell terrier, at the Conejo Creek baseball diamond in Thousand Oaks. (Hans Gutknecht/MediaNews Group/Los Angeles Daily News via Getty Images)
Photos: Russell terrier Macho declared fastest dog baserunner at Dodger Stadium Macho, a 5-year-old Russell terrier, practices at the Conejo Creek baseball diamond in Thousand Oaks for his attempt to set the world record for the fastest dog to run the bases at a Major League Baseball stadium. (Hans Gutknecht/MediaNews Group/Los Angeles Daily News via Getty Images)
Photos: Russell terrier Macho declared fastest dog baserunner at Dodger Stadium Macho, a 5-year-old Russell terrier, practices at the Conejo Creek baseball diamond in Thousand Oaks for his attempt to set the world record for the fastest dog to run the bases at a Major League Baseball stadium. (Hans Gutknecht/MediaNews Group/Los Angeles Daily News via Getty Images)
Photos: Russell terrier Macho declared fastest dog baserunner at Dodger Stadium Macho, a 5-year-old Russell terrier, plays with a balloon after practice at the Conejo Creek baseball diamond in Thousand Oaks for his attempt to set the world record for the fastest dog to run the bases at a Major League Baseball stadium. (Hans Gutknecht/MediaNews Group/Los Angeles Daily News via Getty Images)
Photos: Russell terrier Macho declared fastest dog baserunner at Dodger Stadium Macho, a 5-year-old Russell terrier, practices at the Conejo Creek baseball diamond in Thousand Oaks for his attempt to set the world record for the fastest dog to run the bases at a Major League Baseball stadium. (Hans Gutknecht/MediaNews Group/Los Angeles Daily News via Getty Images)
Photos: Russell terrier Macho declared fastest dog baserunner at Dodger Stadium Macho, a 5-year-old Russell terrier, sits on home plate after practicing at the Conejo Creek baseball diamond in Thousand Oaks for his attempt to set the world record for the fastest dog to run the bases at a Major League Baseball stadium. (Hans Gutknecht/MediaNews Group/Los Angeles Daily News via Getty Images)
Photos: Russell terrier Macho declared fastest dog baserunner at Dodger Stadium Macho, a 5-year-old Russell terrier, gets ready for practice at the Conejo Creek baseball diamond in Thousand Oaks for his attempt to set the world record for the fastest dog to run the bases at a Major League Baseball stadium. (Hans Gutknecht/MediaNews Group/Los Angeles Daily News via Getty Images)
Macho has been declared the fastest dog to run the bases at a Major League Baseball stadium, The Los Angeles Daily News reported.
He ran the basepaths in 21.06 seconds Friday.
Owner and trainer Lori Signs said she was nervous before the record-breaking attempt.
“No matter what, he is still a dog. There could be a stray pigeon, a gopher or a leaf that falls. We were all just holding our breath.”
A Guinness World Records adjudicator flew from New York to Los Angeles to certify Macho’s run an official record-breaker.