Did you know Roger Federer is afraid of dogs?

Roger Federer, champion of 19 Grand Slams and arguably the greatest player of all time, is afraid of dogs. Wilson treated the Swiss to playtime with a group of dogs of all sizes for his 36th birthday back in August.

"I'm a little bit scared of dogs to be honest," Federer said.

Gracious as always, he embraced the moment and played with all of the dogs, even sharing a tale of his dolphin-feeding adventure in Brisbane.

"I love dogs, at the end of the day I do," Federer said. "I just haven't spent enough time with them. We always used to have a cat."