“Dog breeds were created by human beings”
Really...really doubtful, that is.
The Bull-Mastiff, as just one example of hundreds, was developed in England to be a smaller more active Mastiff for use as a night guard for livestock against human poachers - who they would tackle and hold by the throat. The final mix was, IIRC, 3/4 Mastiff and 1/4 archaic Bull-dog.
There is no evidence that dog breeds existed in the wild until domesticated by humans. There were no wild bands of Dachshunds digging up varmints - there were wolves and coyotes and the like.
All genetic and historic evidence suggests that humans domesticated wolves and developed dog breeds from them.