Bulldogs are a non-sporting breed of dog that is originally from the United Kingdom, while pugs are a toy breed that originated from China. While similar in look, they are very different in temperament, height, weight and life expectancy.

Bulldogs are a larger breed of non-sporting dog with a fine coat that constantly sheds. Bulldogs weigh up to 55 pounds while pugs rarely surpass 25. Bulldogs are more prone to hip dysplasia and live for eight to 12 years. Pugs live for 12 to 15 years, are prone to mast cell tumors and are in danger of scratched corneas as a result of entropion, which causes the upper eyelids to fold inward.

Both breeds respond well to consistent and firm training, but bulldogs can be willful and resolute in their chosen course of action. Pugs are animated and rambunctious, whereas adult bulldogs spend much of the day sleeping. Both are short-haired and easy to groom, but bulldogs shed year round while pugs shed heavily only during the shedding season. The pug is believed to be a descendant of the short-haired Pekingese, and one theory postulates that the pug is a cross between the Pekingese and a small bulldog, accounting for their similar appearance.