Yeah - in Dennis Mcnally's "Long Strange Trip"

Wow - I even found the page (502-503)....

And it looks like I've got my stories mixed up - it must have been
someone else with the dog running around their car.

The rest of my memory was right though:

<excerpt>
.....
Some weeks before, Bear had given Mickey Hart, a damaru, a Tibetan
drum made of a human skull.  It did not produce a great tone, and
Mickey put it away.   In the weeks after, he found himself out of
sorts, getting sick, bumping into things, injuring himself in minor
ways.  Finally, he remembered the drum and decided to get rid of it.
At length, Phil Lesh suggested, "Why don't we give it back to the
Tibetans?"  A lama named Tarthang Tulku......accepted and said, "I
hope you have been most careful, Mickey Hart.  This is a drum of
great, great power.  It wakes the dead, you know."  Maybe Mickey
hadn't been so careful.  On June 20,....returning from a Norton
Buffalo gig...  Somewhat the worse for wear from drink, he rolled the
car over the edge of the road and down about twenty feet, where it
caught in the branches of a convveniently located tree.  The next stop
was 300 feet down........Her had a broken arm, a broken collarbone,
several cracked ribs, and a punctured lung, and his left ear was
nearly ripped off his head.

</excerpt>

I'm sure someone else had the dog incident - maybe a crew member.  I'm
already planning on re-reading it in a few months.  There's just so
much in it.  620 pages (not counting Notes, Bibliography, and Index),
and I get most of my reading done before bed, when I'm sleepy to begin
with.  I'm on page 500-something.