I support two charities here in my country. I do not give to PETA though. Their campaigns are too extreme for me with some way too unreasonable. Anyway, the animal welfare groups I support are champions of animal rights here. They run an animal shelter for dogs and cats that they rescued from abuse or just strays that need a forever home. I once volunteered for them, but because my work demands so much of my time, I just give monetary and pet food donations.
Aside from these two groups, I also am a member of animal rights groups on Facebook. I actually got my cats from postings of fellow members there.