The Rise and Fall of the Bone-Crushing Dogs

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A huge and diverse subfamily of dogs, the bone-crushers patrolled North America for more than thirty million years, before they disappeared in the not-too-distant past. So what happened to the biggest dogs that ever lived?

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References:
Dogs: Their Fossil Relatives and Evolutionary History by Xiaoming Wang & Richard H. Tedford.
The Princeton Field Guide to Prehistoric Mammals by Donald Prothero.
Evolution of Tertiary Mammals in North America, Volume 1: Terrestrial Carnivores, Ungulates, and Ungulatelike Mammals edited by Christine M. Janis.
The Skeleton of the Borophaginae (Carnivora, Canidae): Morphology and Function by Kathleen Munthe.
Vertebrates: Structures and Functions by S.M. Kisia.
https://www.ncbi.nlm.nih.gov/p....mc/articles/PMC45072
http://digitallibrary.amnh.org..../bitstream/handle/22
https://www.ncbi.nlm.nih.gov/p....mc/articles/PMC59369
https://www.ncbi.nlm.nih.gov/pubmed/26285033
https://www.researchgate.net/publication/267156822_Phylogenetic_systematics_of_the_Borophaginae_Carnivora_Canidae?enrichId=rgreq-d5b9b9334f3e7d5206bb87428d1dc7db-XXX&enrichSource=Y292ZXJQYWdlOzI2NzE1NjgyMjtBUzoxNTQ5NTc4MzE0NzkyOTZAMTQxMzk1NjIzNDUyOA%3D%3D&el=1_x_2&_esc=publicationCoverPdf
https://www.ncbi.nlm.nih.gov/p....mc/articles/PMC59639
https://www.cambridge.org/core..../journals/journal-of
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