The phenomenon of canines exhibiting an extended tongue is a common observation. It involves the animal’s lingual muscle protruding beyond the confines of the mouth. This behavior is observed in various breeds and contexts, ranging from periods of rest to strenuous physical activity. The degree of protrusion can vary significantly, from a slight tip showing to a substantial portion of the organ being visibly outside the mouth.
The practice serves multiple physiological purposes, most notably thermoregulation. Canines lack sweat glands across most of their body; therefore, they rely on evaporation from the tongue and upper respiratory tract to dissipate heat. Saliva evaporation cools the blood vessels in the tongue, aiding in lowering the body temperature. Other potential contributing factors include relaxation, dental issues causing discomfort, or, in some instances, a manifestation of Canine Lingual Protrusion Syndrome (CLPS), a condition more prevalent in certain breeds.