Pheromonatherapy - that is, the use of chemicals that have pheromonal properties - offers a safe, scientific and effective extension to the range of agents that can be employed in the treatment of a number of behavioural problems. While they are not a panacea for such cases, they can be helpful if used selectively together with other interventions. Although there are reports of clinical efficacy of pheromones in non-companion animal species, including pigs and poultry, the use of pheromone products has been studied most extensively in dogs and cats, and it is on these species that this article focuses