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404 Veterinary Emergency Hospital

Dr. Nancy Mehi, of Mehi Mobile Veterinary Services

905-830-8406 :: Serving Newmarket, Aurora, Sharon, Queensville, Keswick, Sutton,
Pefferlaw, Udora, Uxbridge, Zephyr and King City (Ontario, Canada)

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P.O. Box 48
Queensville, ON L0G 1R0
For after hours emergencies, call the 404 Veterinary Emergency Hospital (open 24/7) at


I am taking a leave of absence from my practice, effective immediately. 

A person in my household has a severely compromised immune system. For the second time in 8 days I have been informed by York Region Public Health that, despite negative responses on Covid screening, I have been exposed to a Covid-19 positive person while doing a housecall. I can no longer risk exposing my family member to Covid, as the consequences could be fatal.  Therefore I will not be doing any housecalls until further notice.  

As I was restricted to essential services only (such as in-home euthanasia) during Covid lockdowns, I did not see many of your pets in 2020. I know this causes frustration and anxiety for many of you who rely on home visits for your pet.  

Phone consultations: I am available Monday – Friday, 9:00 am – 6:00 pm for phone consultations and advice.

Online Vetstore: orders will continue to be processed.

Examination for illness or injury: please contact one of the following.

  1. Holland Landing Animal Hospital (HLAH) (the same hospital as the Vetstore pickup location) at  905-853-3591 to book an appointment with Dr Kirk Kolas, Dr Paul Venditti or Dr Christina Watson. Due to extra hygiene measures and physical distancing requirements, appointment availability may be limited.  Let me know if you book an appointment there and I will email your pet’s medical records to HLAH. 
  2. A local veterinary office in your area. Let me know whom you have booked an appointment with and I will email your pets medical records to them.  
  3. VCA 404 Veterinary Emergency and Referral Hospital 905-953-1933, open 24/7 at 510 Harry Walker Parkway, Newmarket at the corner of Harry Walker and Mulock Dr. 
  4. Veterinary Emergency Clinic (VEC) of York Region at 905-953-5351, open 24/7 at 1210 Journey’s End Circle, Newmarket.  
  5. Another housecall veterinarian. I do not have a specific person to recommend to you, please do an internet search.  

Flea, Tick and Heartworm Prevention

To order flea, tick, and heartworm preventive medication: go to the online Vetstore.

For prescription renewals: Call, text or email me.

If you normally use Heartgard, Nexgard Spectra, Interceptor or Sentinel: these are preventives that can cause a reaction if given to a heartworm positive dog.

Many dogs did not have a blood test done for heartworm infection in 2020 due to Covid lockdowns. Your dog must have a heartworm blood test this year if: 

  • you did not have strict accuracy in administration of heartworm preventives to your dog in 2020, i.e. you were late starting it, missed a month, doses were given more than 30 days apart, or the prevention was stopped too early (last dose should have been given in November).  If you have questions about this ask me.  
  • you want to start on prevention this year but your dog was not on any heartworm preventive in 2020   

Blood test appointments: call either Holland Landing Animal Hospital, another local vet in your area or  another housecall veterinarian if necessary.  If another veterinary office performs the blood test and dispenses the preventive medication let me know so I can update your dog’s medical record.   

Alternative products that can be safely used without doing a heartworm test first are Revolution, Advantage Multi and Simparica Trio.  

I will send out another email once I have resumed doing housecalls. 

Thank you all for your understanding.   

Dr. Nancy Mehi

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