The breed has a fine, glossy coat that comes in a variety of colours, most often fawn or black, and a compact square body with well-developed muscles. Since pugs lack longer snouts and prominent skeletal brow ridges, they are susceptible to eye injuries such as proptosis, scratched corneas, and painful entropion. They also have compact breathing passageways, leaving many prone to breathing difficulties or unable to efficiently regulate their temperature through evaporation from the tongue by panting. They also have compact breathing passageways, leaving many prone to breathing difficulties or unable to efficiently regulate their temperature through evaporation from the tongue by panting. A Pug's normal body temperature is between 101 °F (38 °C) and 102 °F (39 °C). If this temperature rises to 105 °F (41 °C), oxygen demand is greatly increased and immediate cooling is required. If body temperature reaches 108 °F (42 °C), organ failure can occur.
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