Reference > Brewer’s Dictionary > Sick as a Horse.

 Sick as a Dog.Siddons (Mrs.). 
E. Cobham Brewer 1810–1897. Dictionary of Phrase and Fable. 1898.
Sick as a Horse.
Nausea unrelieved by vomiting. A horse is unable to vomit, because its diaphragm is not a complete partition in the abdomen, perforated only by the gullet, and against which the stomach can be compressed by the abdominal muscles, as is the case in man. Hence the nausea of a horse is more lasting and more violent. (See Notes and Queries, C.S. xii., August 15th. 1885, p. 134.)   1

 Sick as a Dog.Siddons (Mrs.). 

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