What are the opening hours?

Monday 9am - 6pm Tuesday 9am - 6pm Wednesday 9am - 5pm Thursday 9am - 6pm Friday 9am - 6pm Saturday 9am - 1pm

Animal Hospital of Nesconset

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United States
Smithtown, NY
Animal Hospital of Nesconset

This well established small animal practice is dedicated to the care and well-being of its patients. Mary L.

Leister, DVM, is a veterinarian with twenty seven years of veterinary experience. Raised in Stony Brook, she studied veterinary medicine at the prestigious Cornell University College of Veterinary Medicine. Experience includes spending seven years practicing with a leading veterinary practice in Bellport, New York; twelve years at Nesconset Animal Hospital; per diem work at Mount Sinai Animal Hospital for the past eight years; and two years serving the community at the Brookhaven Town Shelter Spay and Neuter Clinic.

08/30/2025

PSA: The office will be CLOSED from Saturday 8/30 through Monday 9/1. We will continue normal business hours starting on Tuesday 9/2!

We hope everyone has a safe and fun Labor Day weekend ❤️🤍💙

07/24/2025

🥰🐾

07/21/2025

Saturday we celebrated the “E” Litter with a fun- loving Puppy Shower Pawty 🤍🐾

We can’t wait to watch these beautiful Hovawart babys grow up in this wonderful show line like their mama!

If you can guess right- Dr. Leister is keeping the black female she wished for. Welcome home Echo girl🥰

07/02/2025

PSA:
As the holiday is quickly approaching we would like to remind all clients we will be CLOSED Friday 7/4 and Saturday 7/5 for the Fourth of July.
We will return to normal business hours on Monday 7/7.
Thank you!

Animal Hospital of Nesconset

05/26/2025

Happy Memorial Day to all of our clients & patients. We hope you have a fun, safe day!
*We will return normal business hours tomorrow at 9 am*

05/07/2025

Something I think we can all agree on is that Dr Leister is the BEST!
Here she is showing an aspiring veterinarian, 5 year old Grayson how to do a physical exam on his dog Miley🤍
Great job Grayson!!!

Looking forward to you working here in the future years 😉🐾🤍

05/01/2025

PSA: CLOSED SATURDAY MAY 3, 2025
If medication refills are needed, please plan accordingly.

The Animal Hospital of Nesconset staff will be attending Kristen’s bridal shower as their love story started right here on the grounds of the Animal Hospital of Nesconset all because of this beautiful Saint Bernard, Bonnie🤍

04/29/2025

Josie, Duke and Holly posing for Easter 🤍🌸

03/13/2025

Today we proudly celebrate Gracie’s last day of Chemo!
Keep fighting girly, we love you!!!!😭🤍🐾

02/14/2025

Happy Happy Valentines Day from Guns & Nelli❤️

02/04/2025

Happy belated National Golden Retriever Day!

Pictures is employees pets Gracie & April 🤍
We love Golden Retievers here, but we want to see yours too! Drop your Golden photo below🐾

12/15/2024

We had the best night celebrating the upcoming holidays with our staff at our annual Christmas party!

Each and every one of our staff members holds a special place at the Animal Hospital of Nesconset’s heart. Our core value at this hospital besides holding the best care and love for our patients, is family and having fun as our jobs never an easy one but being together always makes it fun!

We want to wish our clients and patients the best holiday season to come and a very happy, healthy New Year. ❤️

Address

189 Terry Road
Smithtown, NY
11787

Opening Hours

Monday	9am - 6pm
Tuesday	9am - 6pm
Wednesday	9am - 5pm
Thursday	9am - 6pm
Friday	9am - 6pm
Saturday	9am - 1pm

Website

http://www.epethealth.com/

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Our Story

Mary L. Leister, DVM, is a veterinarian with twenty years plus of veterinary experience. Raised in Stony Brook, she studied veterinary medicine at the prestigious Cornell University College of Veterinary Medicine. Experience includes spending seven years practicing with a leading veterinary practice in Bellport, New York; twelve years at Nesconset Animal Hospital; per diem work at Mount Sinai Animal Hospital for the past eight years; and two years serving the community at the Brookhaven Town Shelter Spay and Neuter Clinic.