Hi,
The name is UBU. They say "Sit, UBU, Sit. Good dog". This is as a tag (ad) for the production company UBU Productions, which produced Family Ties (as well as Spin City).
If you have any other questions, feel free to contact me. Also, be sure to visit my web site where you can find a lot of information about the show.
Sincerely,
Daniel Hofverberg
Family Ties Home Page
http://www.familyties.f2s.com