Tiffini Clark

Ms. Clark brings over 20 years' Operations and Management experience to Sierra Veterinary Clinic.

While at Nordic Pharma, she managed the clinical, pre-clinical operations. She also led a team conducting research, managed the manufacturing, which included the design and scope of two clean rooms. Ms. Clark also managed HR, project management and regulatory operations. While part of Dr.’s Hospital Modesto she was the Operations Manager for the clinical research facility. During her time at Pharmacyclics, she was a team member that brought IBRUTINIB (a cancer drug) from discovery into Phase 3 clinical development and was an integral member of the business development team that executed $975M (BTK) transaction with Janssen Biotech, Inc. (IBRUTINIB). Ms. Clark was also an integral member of the business development teams that completed transactions with Novo Nordisk for the Factor VIIa inhibitor, PCI-27483, and the pan-HDAC deal with Les Laboratories Servier (ABEXINOSTAT).

While away from work she enjoys time with her daughter and her two grandchildren, and helps coach her grandson’s little league team. Ms. Clark has a toy teddy bear Pomeranian named Mufassa who has his own Facebook page (he’s kind of a celebrity). Tiffini looks forward to meeting all of the clients that Sierra calls family.

If you need to reach Tiffini please email her at

With the recent shelter-in-place order issued for our community, we wanted to take a moment to let you know that we are open and here for you and your pet!

However with the safety of our clients, patients and employees in mind, our lobby will be closed until further notice. Veterinary services will remain available during our normal business hours with a few adjustments to how we receive you and your pet, including:

Appointments & Medication/Food Pickup

Upon arriving at the clinic, please remain in your vehicle and contact us via phone @ 209-477-4841 to let our team know you have arrived. A team member will then meet you at your vehicle to escort your pet inside for the appointment and/or deliver any products you need to pick up. Payments can be made over the phone, from your vehicle.

We ask that no one who is experiencing flu-like symptoms or who has been exposed to someone who has tested positive for the COVID-19 virus enter the facility at this time.

Refill Requests

To submit a medication or food refill request, please contact us via phone, email or online refill request form. We will contact you when your refill is ready and deliver it to your vehicle upon your arrival.

Thank you for your patience and understanding, and for helping us keep our community safe!


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