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.


191 Yuma St. 
Denver, CO 80223 

Please note: The entrance to the Spay/Neuter Clinic is on the East side of the building.  



Appointments are available on Wednesdays and Thursdays.

Drop-off time for surgery is staggered between 7-8 a.m. to improve social distancing.

Pick-up time is 3:30 p.m. for male cats, 4:30 p.m. for female cats.


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 distemper
  • Microchips $25
  • FeLV vaccine $25
  • FeLV/FIV test $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 distemper
  • FeLV vaccine $25
  • FeLV/FIV test $25

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.