The Dumb Friends League offers affordable spay/neuter services to all owned, pet cats and feral/community cats. We are able to offer these services thanks to the generosity of our donors.

We are not able to provide these services for-profit breeders, or rescue groups at this time. We recommend that tame, friendly cats without owners be taken to an animal shelter for adoption.


4817 National Western Dr.
Denver CO 80216

Please be advised that the CSU Spur campus is still under construction.  Our building is located on the north side of the campus.  

Coming from the south: From 46th Ave, turn left (north) onto National Western Dr.  Continue between the two large buildings under construction.  At the stop sign turn left onto Bettie Cram Dr.  We are housed in the Vida Building, which will be on your right. The entrance is on the west side of the building.  THIS ROUTE WILL HAVE ROAD CLOSURES ON 4/12, 4/19, 4/26, 5/3, 5/10, 5/17, AND 5/24. PLEASE USE NORTH ROUTE ON THESE DATES.

Coming from the north: From 58th Avenue heading west, go past Washington St. and turn right onto Franklin St. which turns into National Western Dr. at the street light at Race Ct.; continue going straight. Continue another ¼ mile to the end of the road. We are on the northwest corner of National Western Dr. and Bettie Cram Dr.

There is limited parking on Bettie Cram Dr., with additional parking in the parking lot off National Western Dr. on the west side of the building. The entrance to the spay/neuter clinic is also located on the west side of the building. Follow the Dumb Friends League signs to the spay/neuter clinic lobby. Check-in will take place on the 2nd floor (elevator is available).



  • Your cat must be 2 months old and weigh 2 lbs for spay/neuter surgery.
  • Pets 8 years and older require bloodwork prior to surgery. Please visit your regular Veterinarian to obtain bloodwork prior to scheduling. This service is also available through the Dumb Friends League Veterinary Hospital for an additional fee. You may contact the hospital at 303.722.5800 for more information.


Appointments are available on Tuesday through Thursday. Additional days may be available pending staffing.

Drop-off time for surgery is between 7 a.m.-8 a.m.

You will be given a discharge time when you drop off in the morning. Pick-up time varies as early as 2 p.m. and 4:30 p.m. and depends on the surgery schedule each day.


Payment is due at the time of service; cash, check and cards are accepted.

Owned, pet cats

  • Spay/neuter surgery $25 – fee includes vaccines for rabies and feline distemper
  • Microchips $25

Feral/community cats

  • All feral cats must be brought in a humane trap
  • All feral cats will receive an ear tip
  • Spay/Neuter surgery is Free – includes vaccines for rabies and feline distemper

Make an appointment

The spay/neuter calendar is opened up one month in advance, on the 1st of every month (unless this falls on a weekend or holiday). If you are trying to book an appointment and do not see anything available, it means that our calendar is full. Please check back on the first of the month to book your cat’s appointment.

To register and make an appointment for an owned, pet cat click here.

For information on how to bring a feral cat into our spay/neuter clinic, please click here.

Patient Portal

Visit the Patient Portal to book appointments and access vaccine records for pets vaccinated through the Spay/Neuter Clinic.

Visite el Portal del paciente para reservar citas y acceder a los registros de vacunas de las mascotas vacunadas a través de la Clínica de esterilización / castración.