TNR stands for Trap Neuter Return and it’s so important to controlling the community (outdoor) cat population. To those of us in the foster/rescue world, it’s a common thing, but so many people don’t know what it’s all about and why we do it. Let’s look at TNR in detail and I’ll answer all your questions on how it works, why it works, and how one shelter is facing overpopulation head on.

Gross Stuff Disclaimer: I’ve included some pics of oddly fascinating and gross surgeries in this post. If that will upset you, please stop at the October 2019 TNR Clinic section.
Fact & Figures
- Average litter size: 3-5 kittens
- Female cats are seasonally polyoestrous, going into heat multiple times a year, often (but not always) based on temperature
- Northern Hemisphere’s Season of love = January – mid-October
- A 15-year-old female cat could produce up to 180 kittens in her lifetime
- Cats typically go into heat every 2-3 weeks until they get pregnant
Sources: Vetinfo, DVM360, The Nest
Quick Q&A
Why is there a cat overpopulation issue?
Cats reproduce at a very fast rate, and don’t have a ton of predators, especially in cities where stray cat populations are extremely high. Past population management practices of euthanasia and food bans weren’t effective, but in areas that practice TNR, shelters see less cats coming through their doors.

How exactly does TNR work?
“These sardines were a trick! But I’m okay with it because I heard ear tips are in this season.” “This surgery would have been more helpful before my three litters last year.”
First, a humane trap is loaded up with nice, stinky fish, like tuna or sardines, or even KFC fried chicken. Although this setup is extremely shady (let’s be honest), most cats give in because they’re hungry. Once in the trap, the cat goes to the shelter for:
- Spay/Neuter
- Vaccination
- Flea treatment
- Ear tip – Makes it easier to quickly ID altered outdoor cats – don’t worry, it doesn’t hurt and they can hear just fine.

Once healed, the cat returns to live ball-less (or ovary-less) and flawless.
Do you have to fix community cats?
Yes. Spaying and neutering makes them calmer and healthier, prevents death during labor, and removes the urge to mate, which also leads to less fights and injuries.
Handsome blue boy says, “So, I have to cancel my date later?” Big boy was likely in a recent fight over a lovely lady. This dude can say good-bye to alley brawls (note the scratches on his nose). Neutering will decrease aggression and the need to fight for territory and dates.
What happens to pregnant cats that come in for TNR?
As long as the cat isn’t in active labor, vets perform a spay abort surgery. I know this can be emotionally jarring, but please remember that the health of the mama cat is paramount. They can die during labor, or have kittens when they are kittens themselves and abandon them in confusion, leaving the kittens to starve to death. The healthiest and best thing is to prevent labor when possible. For more on this topic and common practice, take a look at this article from AnimalSheltering.org.
But kittens are cute, Liz:-( Do we have to stop the cycle?
Kittens are cute. Dying, sick, and genetically deformed kittens are not. According to AnimalSheltering.org, more than 75% of kittens born to feral cats die in the first few weeks, and I’ve seen it firsthand. My current foster kittens, Wonton and Eggroll, were a litter of four, and without human intervention, Eggroll would have been the only survivor:
- One kitten died after birth.
- A caretaker pulled Wonton out of the placenta to save him.
- At just a few weeks old, their brother Jalapeño was humanely euthanized because of a congenital heart defect.
These stories are the norm, not the exception.
My last few minutes with my special boy, Jalapeño. Wonton (top) and Eggroll getting some snuggle time.
Why can’t you adopt them so they don’t have to live outside?
Super friendly cats are adopted, but many community cats aren’t properly socialized. Living indoors is stressful and depressing for them, and with a caretaker, they live just as long as indoor cats. Look how happy my former foster Lemon (Wonton & Eggroll’s mom) is outside:
One week before giving birth and entering the shelter with newborns. After nearly a month at the shelter + foster care. Recent photo of Lemon back home.
But I feel bad when it’s cold or hot.
Don’t worry, community cats are very resourceful survivalists. They’ll find shelter when it’s cold, and they have unique ways to cool themselves (like grooming) when it’s hot. If you’re super concerned, you can build a cat shelter in the winter and create a shaded place for them to relax in the summer.
Why can’t you move all the cats out of a city after they’re fixed?
If you remove an animal from a location that contains everything needed to survive (food, water, shelter), another animal will move in. Because you can’t stop this cycle, the best thing to do is stop reproduction and let the cats stay. As a bonus, they’ll keep rodent populations in check.
TNR Clinics: How One Shelter Is Tackling Cat Overpopulation
ACCT Philly, Philadelphia’s only open intake shelter, had over 17,000 animals coming through its doors in 2019, with 10,000 being cats, mostly strays. Regardless of ACCT’s capacity and limited resources, the shelter’s contract with the city means they must take every animal surrendered, which makes managing intake numbers a priority. Any influx of kittens, especially during the summer months, puts a physical and mental strain on ACCT’s staff, volunteers, and fosters.
ACCT Philly has an ongoing TNR program managed by the amazing Alley Cagnazzi. As part of the program, Alley organizes TNR clinics where vets, vet techs and shelter volunteers spay and neuter about 100 community cats (outdoor-only cats) for free. While these clinics are a huge win, volunteer and foster Marta Gambone dreamed of even larger TNR clinics, so she proposed her idea to Alley.

Alley reflects, “I was so excited. Marta has tons of connections in the vet world and I knew she’d be a huge asset in making these events successful.”
Marta, who is also a Philly Mag 2020 Happening List Volunteer nominee, was confident in recruiting volunteers, “I knew if we put out a call, the local veterinary professionals would respond.”
And boy, did they.
Gross Stuff Disclaimer: Surgery pics ahead.
October 2019 TNR Clinic

Two days before the October TNR clinic, local trapping group Cat Trappers 215 began bringing community cats to ACCT Philly. Once the weekend started, volunteers didn’t know what to expect, but they certainly knew how to deliver, spaying and neutering 267 community cats!

About half of the cats are female, and each can average 12 kittens a year. Just one clinic prevents the creation of 1,200 stray kittens the first year alone, plus many generations of strays.
Wendy, Trooper Vet Hospital

The vets, nurses, techs, and volunteers enjoyed it so much, they wanted to do it again. So, Marta organized another TNR clinic in February 2020: A Date with Spay-ghetti, No Balls. This time, Wendy from Trooper Vet prepped by recruiting more coworkers to join. Her stellar recruiting skills also landed a donation of Revolution, a vet-prescribed flea med.
February 2020 TNR Clinic

While the goal was to perform 200 community cat surgeries, several days of rain sent cats into hiding, so 100 cats were spayed and neutered. This left time for an additional 50 dogs and cats in the shelter to get emergency surgery, including tail amputations and wound repairs. Marta was extremely happy with the clinic, “There are no words to describe the incredible gratitude to selfless volunteers who helped.”

Volunteers also recognize the importance of their contribution, as well as building relationships with other volunteers.
“As a high-volume spay and neuter veterinarian, I view my skills as a gift that I can sometimes donate to others who desperately need it . . . It’s personally fulfilling and allows me to make new friends, network, learn new skills and mentor others.
Dr. Nicole Paul, No Nonsense Neutering and ACCT Philly
Jess from PAWS takes Fat Cat to surgery. Keila from Trooper Vet gives a TNR kitty an ear tip and vaccinations.
Nothing makes me happier than to know I made a positive difference in the life of an animal. Working with an amazing group of like-minded people makes the TNR clinic even more special.
Wendy, Trooper Vet Hospital
In addition to fostering an impressive number of cats from ACCT Philly, The Philly Kitty, and City of Elderly Love, Holly Dixon still finds time to volunteer at the TNR clinics, and shares, “Working side-by-side with so many generous caring people makes the experience even more enjoyable.”

Gross Stuff Disclaimer: You’re about to see two uteruses removed.
TNR in Action: Meet a Community Cat, Mama DC
Sometimes, it’s hard to wrap your head around how this all works. Let’s take a look at Mama DC. She came to the TNR clinic pregnant but was not in active labor. As I mentioned earlier, in these cases, vets perform a spay abort for a number of reasons: It improves the female cat’s health and also helps control overpopulation (read more here). Her caretaker happily shared a pic of her back in her domain, healthy, happy, and sporting a swanky new ear tip.
Mama DC is prepped for surgery. During surgery. Back home. Reproductive cancers and death during labor are no longer concerns.
Hazel: A Dog’s Life Saved
It wasn’t just about the kitties. One of the non-TNR surgeries saved a dog’s life.
A pyometra (pyo) is an infection in the uterus commonly found in unspayed cats and dogs. Without a spay surgery, the uterus ruptures, spreads infection throughout the body, and kills the animal. Many pyos are discovered during TNR procedures.
Hazel, a sweet pup who was surrendered at ACCT, was suspected of having a pyo close to rupturing. Vets and volunteers got to work to save her life.
During surgery, the uterus was touched and it immediately exploded. Next, vets worked to remove the largest (and stinkiest) pyo they had ever seen and clean out as much infection as possible.
All the volunteers were relieved when adorable Hazel woke up post-op. Thanks to the quick response from vets and volunteers, Hazel is alive and thriving in foster care.
Pyo being removed. Ewww. Hazel doing her Obi Wan Kenobi impersonation post-op. Hazel a few days post-op with Dr. Nicole, who helped save her life.
What’s Next & How to Help
You’re invited: Join the next TNR clinic in April!
Marta, the woman whose idea started it all, told me, “We’re always looking for more vets, vet techs, and non-surgical volunteers to join us.” And let’s be honest … how can you resist these two faces?

Want to volunteer?
- Vets & vet techs – Email Marta, marta.gambone@gmail.com.
- Non-surgical volunteers – Email Alley, alley@acctphilly.org.
Marta smiles because Dr. Borrock is about to operate on Harmony Rose, giving her safe exit from the shelter sooner than expected. Jesse from PAWS and new ACCT volunteer Steve (who also adopted a chicken this day because, why not?) sedate cats for surgery. Amy from Cat Trappers 215 with 6 more cats for spay/neuter during the TNR clinic.
Want to donate?
Services are free to trappers who bring community (outdoor-only) cats. But the actual cost for anesthesia, shots and flea treatment is $35/cat. To help cover the cost, donate here.
Need help with strays? Want to learn more about TNR or start trapping?
Live in Philly? Email Alley at ACCT Philly, communitycats@acctphilly.org, and she will help or point you in the right direction. Other Philly TNR resources include Catadelphia, Temple Cats, and Cat Trappers 215.
Not in Philly? Contact your local shelter or Google for TNR programs in your area. In Jersey? Contact Angelo Ruffo, The Mad Catter, for an upcoming info session in Voorhees.
Special Thanks

Thank you to ACCT Philly for providing the space and always pushing for bigger and better solutions for community cats. Big thank you to Alley and Marta for making this entire event a reality, and to all the volunteers, listed below.
ACCT volunteer and foster Jana cleans traps and preps for more trappings. Volunteer Connie took tons of footage during the TNR clinic. Mimi puts an ice pack on this boy’s surgery spot.
If you’re looking for a vet, maybe one of these hospitals is the right place for your pet:
- Dr. Roxanne & Dr. Liz, ACCT Philly
- Dr. Nicole, No Nonsense Neutering & ACCT Philly
- Dr. Janet, Fort Washington Veterinary Hospital
- Dr. Dana, Wissahickon Creek Veterinary Hospital
- Dr. Caroline, Bryn Mawr Veterinary Hospita
- Kielce, Olivia, Wendy, Jules, Trooper Veterinary Hospital
- Erica & Cynthia, Bethel Mill Animal Hospital
- Christina & Kristin, Family Pet Clinic
- Megan & Clair, Metropolitan Veterinary Associates
- Heddy & Olivia, Sugartown Veterinary Hospital
- Kat, Eastern Pennsylvania Veterinary Medical Center
- Sara, Mount Laurel Animal Hospital
- Jesse, Jessica, AnnMarie, PAWS
- Julie, Holly, Mimi, Amanda, Lindsey, Laura, Tammy, Lisa, Dan, Kim, Jana, Tina, Lindsey, Marie, Connie, Ame, Kim, and Steve, ACCT Philly volunteers
- Theresa, Harcum College, Veterinary Nursing Program
- Philadoptables
- Temple Cats
- Cat Trappers 215
- All individual trappers

Related Posts
Why spay and neuter? It’s all in this Top 10 List!
Read about my foster Sprinkle and how a spay saved her life.