Snarf (voiced by Bob McFadden in the original series, Satomi Kōrogi in the 2011 series) is an elder Snarf, properly known by his name Osbert, which he hates. Snarf served as a nursemaid and protector for Lion-O when he was a boy. After Lion-O grew up, Snarf found that often Lion-O did not want to have him "mothering" or protecting him. Still, Snarf has remained loyal to Lion-O and the other ThunderCats. At times, he does come through in a pinch with an idea and takes action when it is needed. Despite his age, he does keep up with the others. Even though not a fighter by skill or nature, Snarf is very agile (he boasts he can outplay anyone at tailbail or kick-the-bucket). He also can communicate with other animals on Third Earth to enlist their help in his tasks, and once even tricked the Ancient Spirits of Evil into giving him a power-up to become a being called Snarf-Ra.
In the 2011 version, Snarf is more of a pet to Lion-O and does not speak English but can make animal sounds (though it seems Lion-O can still understand him).