Changes

*Young animals, usually under 1 years of ages, but can sometimes be up to 10 years or older

*Young animals, usually under 1 years of ages, but can sometimes be up to 10 years or older

*Failure to thrive, small body stature or weight loss

*Failure to thrive, small body stature or weight loss

*Waxing and waning neurological signs due to [[Hepatic Encephalopathy]].  These are usually most severe an hour or two post prandial but this may not be obvious in all cases

*Waxing and waning neurological signs due to [[Hepatic Encephalopathy|hepatic encephalopathy]].  These are usually most severe an hour or two post prandial but this may not be obvious in all cases

**Bizarre behaviour

**Bizarre behaviour

**Head pressing

**Head pressing

**An increase in ammonium concentration in the blood decreases the ability of enzymes to convert uric acid to allantoin, thereby resulting in urate urolithiasis.

**An increase in ammonium concentration in the blood decreases the ability of enzymes to convert uric acid to allantoin, thereby resulting in urate urolithiasis.

*Intermittent vomiting or diarrhoea

*Intermittent vomiting or diarrhoea

===Laboratory Tests===

===Laboratory Tests===