Why is it called a pet peeve if it nothing to do with pets?

Derived from the adjective 'peevish' first attest in 1393, peyvesshe "perverse, capricious, silly," of uncertain origin, possibly modeled on Latin perversus "reversed, perverse," past participle of pervertere "to turn about" pet peeve "the thing that provokes one most" is first attested 1919