Can you give me a sentence using the idiom sick as a dog?

Answer 1

This particular idiom being in evidence since about the 1500s according to the Cambridge dictionary of American idioms.

The saying "as sick as a dog" has its origins in the fact that dogs will willingly eat almost anything and be very ill afterwards. (indeed often eating the very evidence of their being ill soon after they produce it.)

Answer 2

The idiom generally means "I feel as if I'm going to vomit," although it can apply to a general bad feeling while ill. The emphasis is on how you FEEL, not necessarily on how severe the illness is.

"After my mother at the rotten apples, she was as sick as a dog"