A dog gladly admits the ...

A dog gladly admits the superiority of his master over himself, accepts his judgment as final, but, contrary to what dog-lovers believe, he does not consider himself as a slave. His submission is voluntary, and he expects his own small rights to be respected.
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 Axel Munthe

Quotes from the same author

Pasteur himself was absolutely fearless. Anxious to secure a sample of saliva straight from the jaws of a rabid dog, I once saw him with the glass tube held between his lips draw a few drops of the deadly saliva from the mouth of a rabid bull-dog, held on the table by two assistants, their hands protected by leather gloves.
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 Axel Munthe
The wild, cruel beast is not behind the bars of the cage. He is in front of it.
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 Axel Munthe