That's the espisode! I am putting away my Twilight Zone Companion, you beat me to it.
:-) I have that book at home, myself! I think they did a good job with it..nice summaries and it's fun to look through the casts and remember "oh yeah!" What's your favorite episode?
I have read that the wetted pup in custody has a skin condition; that's why he looks that way, and that's one way they ID'd him.