Figure 1. A domestic Canis familiaris specimen
(Shiba inu) observed in a controlled outdoor enclosure,
maintained within a transport chamber (a) for behavioural
stabilization. The subject exhibited tongue-protrusion and
periorbital muscle contraction consistent with Panting-Smile
Syndrome (PSS, n = 1).
Qian, T., Shiba, K., & Doge, S. (2026). Quantitative analysis
of tongue protrusion frequency in Shiba inu under ambient
sunlight. Purr Review Letters, 42(7), 1337–1342.