Dinky was Sullvan's younger brother. He didn't appear in many fanfictions, and eventually died from sickness, as explained by Hot Dog
Dinky shared the same appearance of Sullvan Dog. He was shorter, and had light blue fur. His head was a little bigger, as well.
Dinky had a grumpy personality for his age. He was never interested in going on any adventures, and usually like reading in the woods alone. He still cared about his friends, but he usually pretended he doesn't know them when he's embarrassed.