This is Chester, an almost three month old Great Dane, at the Great Dane Service Project in Ipswich Massachusetts:
He actually has been sick for a day or so. But I really don't know the origin of the phrase "sick as a dog."
I have been sick as a dog for the past 30 or so hours. Bad stomach bug. Violent vomiting.
I am on the other side of it now, I hope, but still feeling bad. Very sore muscles from the heaving.
Apparently I am in good company. Garrison Keillor has had it, and wrote this on his Facebook page yesterday:
Never puked in Dubuque,
Or yorked in Grand Forks,
Or hugged the throne in San Antone,
Never hurled in MOST of the world,
But I got sick something silly in Picadilly.