"I had met those guys around 2007 in Philadelphia. They used to play in these really small venues around town," said Slick.
"There weren't too many people out seeing their shows, but I just fell in love with this band. We kind of just struck up a friendship back then."
Slick was invited to join the band in 2009.
He says that while Dr. Dog's music requires a stripped-down method of playing compared to other bands he's played with, his job is no less challenging.
"It may not be as technically challenging, but playing a song the same way every night with the same emotion is one of the biggest challenges I've had to overcome," he said.
While the band is made up of highly trained musicians, Dr. Dog's latest release, "Be the Void," has elements of punk rock coursing throughout.
"I think the band has always employed a punk rock ethic in mind whether they knew it or not," Slick said.
Members of the band always have appreciated iconic punk bands like The Dead Kennedys and The Clash, he said.
While the recorded-live set-up of Mountain Stage may be somewhat foreign to the band, Slick said the audience can expect an abbreviated version of their typical performances.
"The attitude is to treat it like a normal show. We're definitely going to have the same energy," he said.