We're pleased to offer the following services in the Greater Phoenix Metropolitan Area:


Dr. Greene is well qualified to consult on complicated internal medicine cases and difficult infectious disease cases in dogs and cats. He is a board certified specialist in Small Animal Internal Medicine, and he is also a board-certified specialist in Bacteriology and Mycology (Infectious Diseases). In addition to his veterinary degree, he has a PhD in Veterinary Microbiology. He is an internationally recognized authority on Coccidioidomycosis (Valley Fever) in the dog and cat. Dr. Greene has been serving the Greater Phoenix Metropolitan Area since 1992---longer than any other small animal internal medicine specialist in the area.  In that time, he has seen over 40,000 referral cases. Experience does count.



Our state-of-the-art ultrasound machine features pulsed-wave, continuous-wave, and color-flow Doppler. Ultrasonographic examination of the abdomen, thoracic cavity, heart, thyroid gland, parathyroid glands, and other structures are routinely performed. Color-flow Doppler is available to detect shunts and abnormal blood flow. Ultrasound-guided needle aspiration and tru-cut biopsies are routinely used to collect fluid and tissue samples for various laboratory tests (cytology, culture, histopathology, fluid analysis). In addition, we use ultrasound to guide various therapies. For instance, abnormal fluid accumulations within the abdominal, pleural, and pericardial cavities can be safely drained using ultrasound guidance. We also use ultrasound guidance to create pericardial windows, and to perform alcohol ablation of parathyroid nodules and certain cysts within organs.


We have a wide variety of endoscopes, to facilitate evaluation of veterinary patients of all sizes. Video endoscopy is used to perform all examinations. The following endoscopic procedures are routinely performed: rhinoscopy, laryngoscopy, bronchoscopy, esophagoscopy, gastroduodenoscopy, colonoscopy, vaginoscopy, cystoscopy, and urethroscopy. Associated procedures that are routinely performed include endoscopic biopsies, foreign body retrieval (everything from treble hooks to corn cobs), PEG tube placement (stomach feeding tube), tracheal stent placement, bronchoalveolar lavage, endoscopic electrosurgery, and treatment of strictures with balloon dilation / bougienage.

Endoscopic Ultrasound

Dr. Greene is one of only a few veterinarians in the country using endoscopic ultrasound to perform ultrasound-guided aspiration of hilar lymph nodes.

Doppler Blood Pressure Measurement

Systemic hypertension is a silent killer. Doppler blood pressure measurements are routinely obtained on all patients who are presented for an echocardiogram, and in selected cases where systemic hypertension is a concern.


We perform 10-lead electrocardiograms on selected patients, where arrhythmias are a concern. Also, whenever an echocardiogram is performed, a simultaneously run electrocardiogram (lead-II) is evaluated, to screen for arrhythmias. AliveCor tracings are done on selected cases. We can provide ambulatory monitoring services (event recorder, Holter monitor, AliveCor unit) for cases with suspected intermittent arrhythmias.

Radiographic Interpretation

Dr. Greene is available for radiographic interpretations. Radiographs can be mailed or submitted by email. A Procedure Request Form (by mail or fax) should accompany the request, with the patient signalment and pertinent history filled in. Within 24 hours of receiving the radiographs, Dr. Greene will call the referring veterinarian and will provide a detailed, typed report of his radiographic interpretation.

Procedure Request Forms can be downloaded from this website. Go to New Patient Center and click on Online Forms. Prior to emailing digital radiographs, please call the office: 602-953-9541.

Miscellaneous Diagnostic and Therapeutic Procedures

Dr. Greene is qualified to perform a number of special diagnostic and therapeutic procedures. Examples include stent placement, PEG tube placement, bone biopsies, bone marrow aspirates & biopsies, joint taps, and nasal flushing for certain fungal infections.

Clinical Studies

Phoenix Veterinary Internal Medicine Services is often involved in clinical studies. Recently, we were involved in a Coccidioides Antigen Study in Dogs & Cats. The study aimed to determine whether a novel test for Valley Fever had clinical utility. The enrollment period has passed, and new cases are not being entered at this time.

Emergency & Urgent Care

Emergencies are seen by special arrangement only. For evening or weekend emergencies, please call our office at 602-953-9541. If there is nobody in the office to answer the phone, you may leave a message, and Dr. Greene will be paged.

Types of Pets Seen

At Phoenix Veterinary Internal Medicine Services, we primarily see the following types of pets:

  • Dogs
  • Cats 
  • Exotics

We occasionally perform diagnostic ultrasound and endoscopy on other animal species. Call us for more information.


Phoenix Veterinary Internal Medicine Services accepts payment via cash, check, MasterCard, Visa, American Express, or Discover. So that we can continue to provide you high quality service utilizing the best medical technologies, we request that payment be made at the time services are rendered.


Phoenix Veterinary Internal Medicine Services offers discounted services to our referring veterinarians and their staff.  Pre-approval is required.


Find us on the map

Office Hours

Our Regular Schedule

Phoenix Veterinary Internal Medicine Services


8:00 am-5:00 pm


8:00 am-5:00 pm


8:00 am-Noon


8:00 am-5:00 pm


8:00 am-5:00 pm






  • "Thank you Dr. Greene for coming in the middle of the night for Maggie. She was a great companion."
    Heather C.