Several small dog breeds are prone to underbites, a condition where the lower jaw extends further than the upper jaw. This is often a breed standard in some, while in others it's a common occurrence.
Here are some small dog breeds known to frequently have underbites:
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Pugs: Due to their brachycephalic (short-nosed) nature, pugs often have underbites.
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Shih Tzus: Similar to pugs, Shih Tzus are brachycephalic and commonly exhibit underbites.
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Cavalier King Charles Spaniels: Underbites can occur in this breed.
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Boston Terriers: This breed is known for its underbite, which is part of its distinctive appearance.
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French Bulldogs: Like other brachycephalic breeds, French Bulldogs often have underbites.
It is also important to remember that mixed-breed dogs can inherit an underbite if one of their parent breeds is predisposed to it. So, even if a dog isn't a purebred of one of these breeds, it could still have an underbite.
