The Chug is a small breed, a cross between a Chihuahua and a Pug. It weighs 10 to 20 pounds and stands at 15 to 30 centimetres. It has a muscular face closely similar to a miniature Boxer. Like its parents, the Chug has a compact built, domed heads, large round eyes, ears that are set high and apart and furrowed brows. Muzzles are broad and short, sporting overshot jaws that are Pug-like. The Chugs are brachycephalic, which means they may have trouble breathing especially during strenuous activities. However, some Chugs sport slightly longer muzzles depending on which parent breed the Chug leans toward.
Chugs often have a short and smooth coat. Coat colours vary but usually include black, brown, tan, chocolate, cream, dark brown, fawn, merle, speckled, and spotted. The coat will likely shed due to its heritage since Pugs are one of the heavy shedders and Chihuahuas also do their share of shedding. Make sure that you brush the Chug's coat daily to remove loose hair and avoid matting. Apart from this, brush its teeth, clean its ears and trim its nails regularly to ensure its overall health.