The stabled or stalled horse is commonly fed a restricted-forage diet in contrast to the varied ad libitum high-fibre diet it evolved to consume and this has been linked to the performance of stereotypical behaviour and health problems. This trial aimed to establish whether the behavioural effects observed in short-term trials when stabled horses were provided with a multiple forage diet persist over longer periods. Nine horses participated in an 18-day, cross-over, trial. Two dietary treatments were used [a Single Forage (SF, hay) diet and a Multiple Forage (MF) diet (three long-chop and three short-chop commercially available forages]. Following a 2-day acclimatization, horses were maintained on the forage treatment for 7 days. Horses on the MF treatment performed foraging behaviour significantly more frequently and for significantly longer periods than horses on the SF treatment. There were significant differences in the frequency and duration of foraging on individual forages, indicating that horses demonstrated individual preferences for particular forage. Stereotypic weaving behaviour only occurred on the SF treatment. The results of this study indicate that the potentially beneficial behavioural effects of short-term multiple forage provision do persist when horses are managed on a MF diet for a 7-day period. The results suggest that a MF diet provides a means of enriching the stable horse’s environment, by offering variety and enabling patch foraging behaviour.