I followed by own advice today and it's a good job I did. As an experienced carer and mentor I often have carers ask me what to give their possum for diarrhoea. My answer is always the same - I have no idea! You need to take a faecal sample to a vet. Today, the vet and I were both confident that the colour, consistency and smell of this sample were all hallmarks of a yeast infection. We were both very wrong. There was not a yeast to be seen, but a monoculture of nasty bacteria. Had I treated on assumption it was yeast, and then gone the vet in a few days time when things were not improving, I may have ended up killing my possum. There is only one way to know how to treat a possum with diarrhoea, and that is to first identify the cause. The only way to identify the cause of diarrhoea is for a vet to use various stains that react with different bacteria, yeasts and other bits and pieces, and to look at the faecal sample under the microscope. Then the vet can choose from quite a wide range of options to select the right remedy for that particular problem.