Diarrhoea can have many different causes. Bacteria, viruses and parasites often cause diarrhoea. Colic and diarrhoea can also pop up at the same time. Colic is an illness of the stomach and intestines. Sometimes colic symptoms can be recognised in sweating, rolling and scratching. Even if these symptoms do go away, it's still important to check with your vet. Colic can have very serious consequences if left untreated.