Within the context of 17th century witch-hunting, a kittling was apparently commonly known as some kind of animal.
Perhaps the obvious first guess is a misspelled kitten, or some kind of bird, or a white calf – or lamb?
What animal was “Holt” the witch's familiar spirit?
Reference:
- https://en.wikipedia.org/wiki/Pyewacket_%28familiar_spirit%29
- http://preview.tinyurl.com/zyp8kp4 (Preview to a Google Books link: The Esoteric Codex: Witch Hunting, By Samuel Covington)