Alley Cat Allies is seen around the world as a global champion for the humane treatment of all cats. The organization champions low-cost spay / neuter policies and programs, as well as Trap-Neuter-Return (TNR), and Shelter-Neuter-Return (SNR).
Humane Alliance is a program of the American Society for the Prevention of Cruelty to Animals. Humane Alliance is an excellent reference about spay / neuter as a solution to pet overpopulation. Based in the United States, Humane Alliance provides guidance and training in high-volume spay / neuter practices.
Best Friends Animal Society has the United States' largest no-kill sanctuary for companion animals, along with running programs that reduce the number of animals entering shelters.
Canadian Federation of Humane Societies is a Canadian animal welfare organization for positive, progressive change to end animal cruelty, improve animal protection and promote the humane treatment of all animals.
Cats International is a non-profit, educational organization dedicated to helping people solve behavior problems to keep cats in loving homes.
The CATalyst Council exists to connect & collaborate to advance the health, welfare and value of companion cats.
Humane Society of the United States is the largest animal protection organization in the United States. They advocate for and provide hands-on care to animals and offer training & education to other organizations. They also maintain a database of feral cat organizations in the U.S. and Canada (click here for Ontario).
Little Big Cat is a source of information on holistic health, behavior, and nutrition for your cat (or dog!)
PAWS London is a not-for-profit enriching the lives of companion animals in London, Ontario, and region. Partnered with East Village Animal Hospital (EVAH), which is a high-volume spay / neuter and medical animal hospital with accessible costs.