I've seen 2 quality Colby dogs. Both of them were off Colby's Otis out of littermate sisters, and this was back in the 90s. One went over an hour in a check with a son of Ch.Tramp, and I watched the cousin, off Otis, snatch the teeth out and about a ruin a quality champion dog in about 45 minutes. I saw some pretty decent dogs off both of those males, but as far as I know, they were never bred back to any quality Colby bitches.