Bolt, a yellow Lab-Golden Retriever cross service dog in training sponsored by the Los Angeles Chargers visits during training camp on Friday, August 21, 2020 at Jack Hammett Sports Complex in Costa Mesa, CA.

Bolt, a yellow Lab-Golden Retriever cross service dog in training sponsored by the Los Angeles Chargers, visits Training Camp on Friday, August 21, 2020 at Jack Hammett Sports Complex in Costa Mesa, CA.

Los Angeles Chargers quarterback Justin Herbert (10) pets Bolt, a yellow Lab-Golden Retriever cross service dog in training sponsored by the Los Angeles Chargers during training camp on Friday, August 21, 2020 at Jack Hammett Sports Complex in Costa Mesa, CA.

Houston Texans defensive end J.J. Watt, left, greets Sully, the dog who had belonged to former president George H.W. Bush, before an NFL football game between the Houston Texans and the New England Patriots Sunday, Dec. 1, 2019, in Houston.

Dogs used by first responders wear protective eyewear as they sit on the field at Azteca Stadium during a ceremony at halftime of an NFL football game between the Oakland Raiders and the New England Patriots, Sunday, Nov. 19, 2017, in Mexico City. The ceremony was held to honor those who gave aid during a Sept. 19, 2017, earthquake in Central Mexico.

Bolt, a yellow Lab-Golden Retriever cross service dog in training sponsored by the Los Angeles Chargers, visits Training Camp on Friday, August 21, 2020 at Jack Hammett Sports Complex in Costa Mesa, CA.

Julie Cousins, left, and Washington Redskins quarterback Kirk Cousins stand with their dog "Bentley," before the second baseball game of a split doubleheader between the Washington Nationals and the Miami Marlins at Nationals Park on May 14, 2016, in Washington. The Nationals won the first game 6-4.

Frisbee Dogs perform at halftime during a week 1 preseason NFL football game between the Denver Broncos against the Chicago Bears, Thursday, Aug. 11, 2016, in Chicago. The Broncos won 22-0.

Tampa Bay Buccaneers quarterback Jameis Winston plays with his puppy while watching practice for the East-West Shrine college football game on Jan. 20, 2016, in St. Petersburg, Fla.

Miniature monkeys riding dogs herd sheep at halftime during a week 10 NFL football game between the Houston Texans against the Cincinnati Bengals on Monday, November 16, 2015 in Cincinnati. The Texans defeated the Bengals 10-6.

Cincinnati Bengals quarterback Boomer Esiason (7) poses with his dogs for his Pro Line Profile trading card in Cincinnati on May 8, 1992.

Running back Rashad Jennings tapes a feature with his dog on Oct. 28, 2014 in Secaucus, N.J.

Safety James Ihedigbo with his dogs at his home on July 10, 2014 in Houston, Texas.

Frisbee dogs perform at halftime during an NFL football game between the Cincinnati Bengals against the Buffalo Bills, Sunday, Sept. 22, 2019 in Orchard Park, N.Y. The Bills defeated the Bengals 21-17.

Frisbee Dogs perform at halftime during an NFL preseason football game between the Miami Dolphins against the Chicago Bears on Thursday, August 13, 2015 in Chicago. The Bears defeated the Dolphins 27-10.

Cornerback A.J. Jefferson smiles as he sits with his dog after NFL training camp football practice at Northern Arizona University on July 27, 2012, in Flagstaff, Ariz.

Vernon Davis, tight end for the Washington Redskins at home, on June 11, 2014, in San Jose, Ca.

Oakland Raiders quarterback E.J. Manuel spends time with his dog, Titan, a pit bull, at his parents' home in Chesapeake, Va., on June 20, 2014.

Arizona Cardinals linebacker Karlos Dansby poses for a photo with his dogs on July 6, 2010.

Former quarterback David Garrard poses for photos on December 18, 2007 in Jacksonville, Florida.

New York Jets running back Matt Forte and his dog, Ali.

New York Giants wide receiver Brandon Marshall poses for a photo with his dogs on August 1, 2010 in Miami, Florida.

Former Buffalo Bills running back and Hall of Famer Thurman Thomas takes in the view of Lake George with his dog Snoop by his side on Saturday, July 28, 2007.

Sammy Baugh pets his dog Cow Patty at his West Texas ranch near Rotan, Texas, in 1998.

Pittsburgh Steelers quarterback Terry Bradshaw "interviews" his pet dachshund during a practice session at Three Rivers Stadium on Dec. 29, 1979 in Pittsburgh. Bradshaw was being interviewed by a television crew in preparation for Sunday's AFC playoff game against the Miami Dolphins, when the taping went to the dogs.

Jacksonville Jaguars quarterback Chad Henne poses for a photo with his dog on July 6, 2010.

Dogs race at halftime of an NFL preseason football game between the Oakland Raiders and the St. Louis Rams in Oakland, Calif., Friday, Aug. 14, 2015.

Brett Favre eats breakfast with his dog "Jaz" at his home in Green Bay, Wis. in December of 1998.

Former safety Yeremiah Bell poses for a photo with his dog on July 6, 2010.

The 1922 Oorang Indians, a team that included Jim Thorpe (second row, center). The team was sponsored by the Oorang Aierdale Dog Kennels of LaRue, Ohio.

New Orleans Saints defensive end Doug Atkins plays with his bulldog, Rebel, as he relaxes with his wife, Joyce, on Dec. 20, 1969 in New Orleans, before the final game of his 17-year career in the National Football League.

Terry Bradshaw's mother, Novis Bradshaw, and the then-21-year-old Steelers QB flash smiles in the hospital on May 29, 1970 in Pittsburgh, where earlier in the week Terry underwent minor surgery to have a calcium deposit on his right thigh removed. The stuffed dog is a gift from a friend sent to Bradshaw, who was the No. 1 overall pick in the 1970 NFL Draft. (AP Photo/Harry Cabluck)

Wide receiver Davone Bess poses for a photo with his dog on July 6, 2010.

Two dogs and neck and neck as they race for the goal line in a halftime wiener dog race during the Oakland Raiders 2017 NFL week 4 preseason football game against the Seattle Seahawks, Thursday, Aug. 31, 2017 in Oakland, Calif. The Seahawks won the game 17-13.