About Us


The mission of Altered Tails is to provide accessible and affordable spay/neuter solutions for companion animals and free-roaming cats. Our vision is to eliminate euthanasia as a means of population control for companion animals and free-roaming cats.  We are a not-for-profit organization dedicated to providing high quality professional veterinary services and are committed to:

  • Provide affordable spay/neuter service to owners who could not afford to do so otherwise.
  • Offer affordable vaccines and other vital services to owners of companion pets and rescue organizations.
  • Reduce the number of feral cats living in our communities through our Trap, Neuter, Return (TNR) program.
  • Help eliminate euthanasia as a form of population control.


Altered Tails is a grassroots organization with a rich history of providing high quality services at low cost for all residents of the Phoenix area.

  • 1999 – AzCATs founded to assist community in Trap, Neuter & Return (TNR) of free-roaming/feral cats
  • 2003 – Altered Tails incorporated to facilitate spay/neuter of companion animals and free-roaming cats through collaborations with local veterinarians
  • 2006 – Altered Tails purchases mobile sterilization vehicle which traveled to different communities to provide affordable sterilization services
  • 2007 – Bea and Dick Barnhart donated a building at 950 W Hatcher Road, to be the future site of the Altered Tails Barnhart Clinic
  • 2009 – AzCATs and Altered Tails merged and Altered Tails Barnhart Clinic opened the doors of its new permanent facility on 11thAvenue and Hatcher.
  • 2011 – Altered Tails became the first and only Humane Alliance Clinic in Arizona.  Sterilization surgeries topped 8,000.
  • 2012 – Altered Tails expands its services to two full time veterinarians.
  • 2013 – Altered Tails expands its services with an additional location in the East Valley
  • 2014 – Altered Tails provides over 17,000 spay/neuter surgeries
  • 2015 – Altered Tails begins new program, W.A.G.S. (Wheels for Animals Getting Spayed/Neutered) in the East Valley. Combined clinics provide over 20,000 spay/neuter services
  • 2016 – Altered Tails expands our operations even further with a new clinic in Tucson, AZ