Dakin Humane Society is a 501(c)(3) organization with two locations — Springfield and Leverett, Massachusetts. I have been a volunteer there for more than a year and I believe in the work that they do.
Artists for Animals was co-founded by photographer Teresa Berg and Dallas Symphony Orchestra's Erin Hannigan to coordinate their talents with those of other artists in the area in an effort to raise money and bring awareness to animal rescue organizations in North Texas. They are a 501(c)(3) charity so your donations are tax deductible.
Operation Pets Alive is a 501(c)(3) corporation located in Montgomery County, Texas. In addition to local adoption and animal welfare service, Operation Pets Alive (OPA) takes dogs out of shelters where they are at-risk and place them in foster care before they arrange for transportation of the dogs to receiving shelters in Colorado or New England. I first was introduced to these folks because of my volunteering at Dakin, one of the shelters that receives the dogs.