Rio Grande Valley Humane Society Low-Cost Vaccine Clinic
County shelter · 18038 Garrett Rd, Harlingen, TX 78552
Checked Oct 21, 2026 on the clinic's website · How we check
The short version
Low-cost shots, microchips and flea and heartworm meds at a monthly clinic in Harlingen, 9am to 11:30am. Rabies shot is $13. You must register online first, and there are no refunds.
Appointment only, no walk-ins
Not for everyone: check who qualifies below
Prices are on their site (12 listed below)
Who can use it
For people who live in the Rio Grande Valley.
Pet must come with you to get shots or meds
Rabies shot: pets at least 3 months old
Dog DHPPV and Bordetella shots: at least 6 weeks old
Nexgard: dogs at least 4 lbs
Cat Revolution: over 8 weeks old and over 5 lbs
Heartworm meds need a printed negative heartworm test from the past 12 months
Meds are sold only in the right size for the weight you register
Only the pet you registered can be seen
How to get in
Register online. Sign-up opens at least 2 weeks before each clinic. You pick a time, but pets are still seen first come, first served. Walk-in microchips at the shelter need no appointment.
Vaccine clinic once a month, 9am to 11:30am. You must arrive in that window. Walk-in microchips at the shelter in the afternoon.
What it costs
Rabies vaccine
$13
Rabies metal tag
$11
Dog DHPPV vaccine
$16
Dog Bordetella vaccine
$16
Cat FVRCP vaccine
$16
Dewormer
$16
Microchip (at the clinic)
$11
Microchip (walk-in at the shelter)
$25
Dog flea and tick preventative, 1 month
$26
Flea and tick preventative packages (dog or cat)
$52-$156
Dog heartworm preventative, 1 month
$7
Dog heartworm preventative packages
$14-$42
What they do
rabies vaccine
dog DHPPV vaccine
dog Bordetella vaccine
cat FVRCP vaccine
dewormer
Tri-Heart heartworm preventative (dogs)
Nexgard flea and tick preventative (dogs)
Revolution flea/tick preventative (cats)
microchip
rabies metal tag
walk-in microchipping at the shelter
For dogs, cats.
Good to know
Cats must each be in their own carrier. Dogs and cats must ride inside the vehicle, not in a truck bed. No refunds or rescheduling if your pet misses the clinic. Call 956-556-5885 to check shelter hours before walking in for a microchip.
Spay / neuter clinic · 500 E. Hackberry Ave, Suite 100-B, McAllen
Cat spay/neuter $89
Nonprofit spay and neuter clinic in McAllen, by appointment. Dogs $125, cats $89, with a non-refundable deposit to book. Drop off 7:30 to 8am, pick up 3 to 3:30pm.
Spay / neuter clinic · 2451 N US Expressway 281, Edinburg
Cat spay/neuter $75
Three spay and neuter days each month in Edinburg for Rio Grande Valley residents. Cats from $75, dogs from $100. Sign-up opens at 10am on the 1st of each month and fills fast.
Spay and neuter clinic days run by the RGV Humane Society. Dogs $175, cats $150. The surgery site is announced before each clinic. Register online and pay when you drop off your pet.