Your leader in veterinary care in the Long Island City area

Let us prove it! Our knowledgeable and helpful staff are anxious to assist you and your furry family member.

All visits are by appointment only. Please call or email us to book your next appointment now!

Starting March 2022 All spay and neuter will get Free Distemper and Rabies. Call to book your appointment today.

Schedule Today


This Educational Article Sponsored By

Giardiasis is an intestinal infection caused by Giardia – one-celled parasites – that invade the gastrointestinal tract and cause diarrhea.

Giardiasis can spread to humans.


Giardias thrive in non-flowing water, such as ponds or lakes. They are transmitted to dogs in two ways:

  1. Drinking contaminated water
  2. Eating or sniffing contaminated ground

If your dog drinks contaminated water with giardia in the cyst stage, the cysts attach themselves to your dog’s intestines and mature inside its body. Eventually your pet will pass the infective cysts in its stool.

Dogs that hunt prey such as birds and rabbits can also get the giardia parasites.

The disease is not fatal unless the dog’s immune system is young or compromised. Therefore, if there are Giardia cysts in a healthy adult dog’s stool, it is usually nothing to worry about. However, in puppies or elderly dogs, they may cause severe, and possibly fatal, diarrhea if not treated properly.


  • Sudden diarrhea with a green tinge and blood, and then constant diarrhea
  • Vomiting and dehydration
  • Weight loss
  • Lethargy
  • Abdominal pain
  • Fever


To diagnose giardiasis, your veterinarian may perform the following:

  • Examination of a stool sample, using a zinc sulfate fecal flotation test (a regular fecal flotation test might not detect the microscopic cysts)
  • Endoscopy (a procedure using a small, flexible tube to check the abdomen)


After diagnosing giardiasis, your veterinarian will do some or all of the following:

  • Prescribe medicine to kill the giardia
  • Prescribe other medications to treat diarrhea and dehydration
  • Start IV fluid therapy if the dog is dehydrated


  • Don’t let your dog drink from streams, ponds or swamps
  • Avoid public areas polluted with feces
  • Vaccinations are usually only recommended only for dogs with a high risk of contracting the disease

Giardiasis can affect humans. If your dog has Giardiasis, you must disinfect shared areas with bleach and practice good personal hygiene. It is also crucial to be extra careful when cleaning up after infected animals.


In most cases, your dog will recover successfully with proper care.

If not treated promptly in puppies, older dogs, and weak dogs, giardiasis may be fatal.

Get in touch with our Team

Use the information below to get ahold of us, or submit the form and a member of or staff will get back to you as soon as possible.

Contact us any time

To send us a message, use the contact form or the information below. A caring member of our knowledgable staff will do their best to respond to your inquiry as soon as possible. If you are experiencing an emergency, please call us.

The communication methods below are monitored during our facility's regular business hours.

Long Island City Phone: 718-752-1488
FAX: 718-752-1499

Astoria Animal Society is a non-profit veterinary practice.


Fill out my online form.