In Nethack, several roles by default start with a kitten or a small dog, chosen at random. They seem to be very similar: both have similar growth cycles and behaviors. Is there any substantial difference between them that is relevant to the gameplay? Do they behave differently, for example?
Kittens and little dogs are statistically identical, except for a few differences:
(Source: Nethack Wiki, and Nethack 3.4.3 source code).