image of Haematochezia
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Haematochezia is defined as the presence of blood in the faeces. While this technically includes melaena, it is generally understood that haematochezia refers to red, undigested blood in the faeces, while melaena refers to black, tarry, digested blood in the faeces. This chapter covers relevant history, physical examination, diagnostic tests and differential diagnoses.

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Image of 21.1
21.1 Typical appearance of haematochezia. Note the obvious spots and streaks of red blood in the dark, diarrhoeic faeces.
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21.2 General diagnostic approach to haematochezia in the dog.
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