That's why I put Lassie's gender in quotes. I don't think it was specifically pointed out at the meeting but was common knowledge at the rally, I'm sure.
For monetary donations, there have been a number of groups fighting this bill. Two that have been very active are PetPAC,
http://www.petpac.net, and SaveOurDogs,
http://www.saveourdogs.net. You can probably also do a search to find other groups. A number of police organizations have been working to fight this, too. One being COPS.
The members of the Local Government Committee are Senators Gloria McLeod (Chair), Dave Cox (Vice Chair), Tom Harmon, Christine Kehoe, and Michael Machado. If you search the CA legislature website,
http://www.legislature.ca.gov/, you can find mailing address for each.
I have no idea about opponents to Levine in campaign. I am not near his district (So. Cal somewhere) so am not up to date on that. I'm sure some simple searching will yield results.