Colonic impaction is inintractable constipation which can occur in all species, including the dog and cat. There are hardened faeces in the colon and a delayed or failure of faecal passage. The cause may be primary, | Colonic impaction is inintractable constipation which can occur in all species, including the dog and cat. There are hardened faeces in the colon and a delayed or failure of faecal passage. The cause may be primary, |