A greyhound named Holly, a retriever named Lucky and a mutt named Mogli don’t have much in common, appearance-wise. Holly, a retired racing dog, is tall, sleek and lean. Lucky is a wiry hunting dog with reddish-gold fur who loves to fetch tennis balls. Mogli is shorter, like a Border collie, with a friendly face and a glossy black coat. He’s always wagging his tail.
The similarities are uncanny. Bone tumors, whether from a teenager’s leg or the paw of the teen’s pet dog, look virtually identical. If you biopsy those tumors and examine them under a microscope, you’d be hard pressed to tell one from the other.