Bob Weir won't be on the road this year with RatDog, after all. "Circumstances have necessitated that all scheduled tour dates for Bob Weir and RatDog are being cancelled," the band announced via Facebook. "We sincerely apologize for any inconvenience."

No reason was given for the cancellations, which even include a 2015 destination event to be held in Jamaica. Weir, who began playing in jug band that evolved into the Grateful Dead as a 16-year-old, has suffered at least one health scare of late -- but nothing that would suggest retirement from the road.

He memorably fell over on stage in Port Chester, N.Y., in 2013. Longtime bandmate Phil Lesh came to Weir's defense. "You could see Bob having some problems," Lesh said from the stage. "He hurt his shoulder today and had to see the doctor. We're going to finish the set for you." A month of shows were called off back then.

As far back as 1990, however, Weir said he was on the path to a cleaner, straighter life. "My idea of a good time," he said, "often doesn’t include getting intoxicated these days."

Weir's friend and Grateful Dead co-founder Jerry Garcia died in 1995. Ratdog began that same year and, even decades later, was certainly still able to command a stage -- as evidenced by their well-received appearance at this year's Mountain Jam.

RatDog was to begin a new tour on Thursday (August 14) in Boston, with shows continuing through September in Nashville. Stops at the Peach Music, Lockn' and Phases of the Moon festivals are also now off. Weir was scheduled to appear as part of a one-night-only Further reunion at Lockn,' as well. Full and complete refunds, Ratdog says, will be available at places of purchase.

Watch Bob Weir & Ratdog Perform 'Me and My Uncle' at Mountain Jam X

More From Ultimate Classic Rock