Was that the real Lassie in Sacramento protesting AB1634?

No, that was not the official Lassie in Sacramento. Jon Provost and Bob Weatherwax went to the capitol to protest as private citizens and took one of Bob's dogs with them. Because of the long history of the Weatherwax family, many assumed it was Lassie, and some reports even called the dog Lassie, but in fact, the Weatherwax family has had no association with Lassie since 2003.

While Lassie's owner/trainer Carol Riggins, and the owners of lassie.net were also strongly opposed to the bill, in the long history of Lassie, Lassie has never been used as a tool for political purposes of any kind.