ELI5 Wolves - why are there big cats but not big dogs in the wild?

ELI5 Explain Like I'm 5: Bite sized answers to stuff you should know about - in a mini podcast

Why are there big cats but not big dogs in the wild while there are lots of big cats? Why are wolves so hard to tame? How were prehistoric men able to domesticate wild wolves? How have wolves been portrayed in different cultures and mythologies throughout history?

... we explain like I'm five

Thank you to the r/explainlikeimfive community and in particular the following users whose questions and comments formed the basis of this discussion: minntyy, avec_serif, fiendishrabbit, logicalbasher, lithuim, agilepersonality2058, copperpoint, mrmikejj, good-mcrn-ing and fimbulwinter91

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