This chapter describes those behaviours which involve a transfer of chemicals for communicative purposes. Such transfer involves both depositing chemical signals on to physical objects and onto others; both those of their own species and other species (most commonly humans, despite our inability to detect such chemicals). For specific behaviours such as allo-rubbing, it is believed that as well as depositing chemical signals, cats are also acquiring chemical and olfactory information from those they rub on.

Although this is a field which still requires a great deal of research for better understanding of the exact nature of chemicals released and information transferred, one aspect which has received a great deal of attention is pheromone use. Pheromones are understood to be important chemicals in feline communication.