Dougal is dim-witted and childlike. In "Chirpy Burpy Cheap Sheep", it is revealed that Ted has made him write a list of things that do not exist, which is on a pull-down chart in their bedroom. Often he says things that Ted specifically told him not to say, such as by asking about Bishop Brennan's son, as well as shouting to Ted to ask if the Bishop found a large number of rabbits that they are hiding in the parochial house (fortunately for Ted, the bishop was more concerned about Dougal addressing him by his first name instead of using his proper title). In "The Mainland", he forgets to have any breakfast and fails to realise this until he and Ted are waiting for Father Jack at the optician. He also nearly gave a visiting bishop a heart attack when he screamed in excitement after remembering the director’s cut of "Aliens" was airing on television that night.