WATCH: Dog throws off Bob Bryan's serve in WTT

Lots of things can cause a player to stop their serve mid-motion: a sudden breeze, a disruption from a fan, a ball from another court.

But something rarer—and cuter—happened at World TeamTennis on Wednesday, when Bob Bryan, serving for the Vegas Rollers, had his groove interrupted by a barking dog:

The camera initially zoomed in to blame Taylor Townsend's mini goldendoodle, Winston. (Townsend was playing mixed doubles against Bryan for the Philadelphia Freedoms that set.)

(Ryan Loco)

However, the barker in question turned out to belong to Hailey Baptiste. Meet Tsonga:

(Ryan Loco)

Tsonga—named after Jo-Wilfried Tsonag—has been a staple courtside all month long, usually hiding out under tables, but he gets a little excited when other dogs are around. If it's any consolation for Winston being "framed," Townsend and Fabrice Martin went on to take the set in a tiebreak, and the Freedoms would score a 25-16 win overall.

The victory marked Philadelphia's fifth consecutive win and kept them in first place in the league standings.

It seems Winston is both a good boy and good luck.

For more photos, videos, results and live action from World TeamTennis, go to WTT.com.