Changes

*'''Anorexia''' and severe '''weight loss'''

*'''Anorexia''' and severe '''weight loss'''

*[[Control of Feeding - Anatomy & Physiology#The Vomit Reflex|'''Vomiting''']] which may contain blood if blood vessels are eroded ('''haematemesis''').  Vomiting occurs due to gastric irritation and possible gastric outflow obstruction.   

*[[Control of Feeding - Anatomy & Physiology#The Vomit Reflex|'''Vomiting''']] which may contain blood if blood vessels are eroded ('''haematemesis''').  Vomiting occurs due to gastric irritation and possible gastric outflow obstruction.   

*[['''Diarrhoea''']] which may show evidence of haemorrhage in the upper gastro-intestinal tract ('''melaena''').  Diarrhoea occurs due to the production of excessive volumes of gastric secretions and because gastrin reduces the ability of the intestine to absorb fluid and electrolytes.  Malabsorption may occur due to small intestinal villous atrophy.

*'''[[Diarrhoea]]''' which may show evidence of haemorrhage in the upper gastro-intestinal tract ('''melaena''').  Diarrhoea occurs due to the production of excessive volumes of gastric secretions and because gastrin reduces the ability of the intestine to absorb fluid and electrolytes.  Malabsorption may occur due to small intestinal villous atrophy.

*'''Collapse''' and '''shock''' if an ulcer perforates to cause peritonitis.

*'''Collapse''' and '''shock''' if an ulcer perforates to cause peritonitis.

*Severe haemorrhage may result in '''pallor''', '''tachycardia''', a '''haemic murmur''' and '''collapse'''

*Severe haemorrhage may result in '''pallor''', '''tachycardia''', a '''haemic murmur''' and '''collapse'''

Affected animals may also show signs of [[Oesophagitis|oesophagitis]], including regurgitation and hypersalivation.

Affected animals may also show signs of [[Oesophagitis|'''oesophagitis''']], including regurgitation and hypersalivation.

===Laboratory Tests===

===Laboratory Tests===