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Both humans and dogs are two of the very few species who continue to play as adults. This has led researchers to theorise that dogs are "infantile" wolves and humans are "infantile" apes, as they never stop displaying characteristics of the very young. Even the most crotchety old human is a lot more flexible than most other adult mammals.

Humans who speak different languages often use the same sounds with training animals. Short repeated sounds encourage activity (like: go! go! go! go!) and a long, low tone encourages slowing down. (like: eeaaaaaasssy)