'Shark teeth', officially known as persistent deciduous teeth (PDT), is a disorder where there's two sets of gnashers coming out of a row of gums. This dog's retained baby fangs are circled in red.

Baby (or deciduous) teeth contain mesenchymal stem cells, the kind that can develop into tissues like bone, nerve or muscle.

Seven per cent of pet dogs – mostly small, “toy” breeds – have doubled-up teeth, reminiscent of sharks’ mouths. The condition, known as persistent deciduous teeth, occurs when the dog ...

Normally, by 6 months of age, all permanent teeth have erupted, and all deciduous teeth have fallen out," they say. The American Kennel Club asserts that once your dog has a full set of adult ...