Spirocerca infection and canine ehrlichiosis are diseases every dog owner in Israel should understand. Their transmission and treatment differ, but consistent prevention and early detection can help prevent serious complications from both.

In Israel, Spirocerca infection is commonly called "park worm disease," while canine ehrlichiosis is often called "tick fever." This guide focuses on veterinary care in Israel; medication options, labeling, and prevention protocols may differ in the United States.

Collapse, difficulty breathing, significant bleeding, or very pale gums require immediate emergency veterinary care. Do not wait until your dog's next preventive treatment is due.

Spirocerca: A Disease That Can Develop Silently

How Do Dogs Become Infected?

The esophageal worm, Spirocerca lupi, is usually transmitted when a dog swallows an infected dung beetle. Dogs can also become infected by eating an animal carrying the larvae, such as a lizard or rodent. Beetles ingest parasite eggs shed in an infected dog's feces, allowing the parasite to continue developing inside them.

Eating grass or scraps off the ground can lead to accidentally swallowing a beetle. Simply touching soil or playing on grass does not transmit the infection. Discourage scavenging, pick up feces, and teach your dog to leave food found outdoors alone.

From the Stomach to the Aorta and Esophagus

After ingestion, the larvae are released in the stomach, penetrate its wall, and migrate through blood vessels to the aorta. They eventually reach the esophageal region and form inflammatory nodules called granulomas. Some lesions can become cancerous. Migration can damage blood vessels before any eating difficulties become apparent. Veterinary explanation of the life cycle.

Spirocerca Symptoms That Need Veterinary Attention

Possible signs include regurgitation, difficulty swallowing, drooling, coughing, weight loss, and sometimes vomiting. Aortic rupture can cause internal bleeding and sudden death, sometimes with little warning.

Diagnosis may involve imaging, endoscopy, and fecal testing. A negative fecal test does not rule out infection. A confirmed infection requires a treatment plan and follow-up monitoring; a routine preventive injection is not a substitute. More about symptoms and diagnosis.

Spirocerca Prevention: Injections, Topical Treatments, and Timing

How Often Is Treatment Needed, and Why Isn't the Injection a Vaccine?

The commonly used doramectin injection is an antiparasitic treatment, not a vaccine that trains the immune system to recognize the parasite. It targets parasites already in the body to reduce the risk of disease; it does not provide a continuous barrier against new infection.

There is no universal rule requiring treatment every 2.5-3 months. Israeli clinics use protocols ranging from every two months to every three months, depending on veterinary guidance and risk. Monthly protocols using certain topical products containing moxidectin and imidacloprid are another option. Not every topical flea treatment is suitable for this purpose. Professional information on prevention options.

Side Effects and MDR1 Drug Sensitivity

Possible injection side effects include a local reaction. Tremors, an unsteady gait, or unusual weakness require urgent veterinary attention. A mutation in the ABCB1 gene, commonly known as MDR1, can increase sensitivity to certain medications, including doramectin.

The mutation occurs in breeds including Collies, Shetland Sheepdogs, Australian Shepherds, and some mixed-breed dogs. Risk also depends on the medication, dose, and route of administration. Not every herding dog is affected, and not every product is unsuitable. Your veterinarian can tailor the treatment and determine whether genetic testing is appropriate. Information from Washington State University.

How Much Does a Spirocerca Injection Cost?

There is no standard U.S. price to quote. Spirocerca prevention injections are not a routine part of preventive care for most dogs in the United States, so pricing depends entirely on the clinic. Ask your veterinarian for a quote, and ask whether an examination is included.

Canine Ehrlichiosis: Understanding "Tick Fever"

Acute, Subclinical, and Chronic Infection

Canine ehrlichiosis is a bacterial disease, commonly caused by Ehrlichia canis and transmitted primarily by the brown dog tick. The tick feeds on blood and can transmit the bacteria during feeding. Ticks can also establish infestations in yards and around the home.

The acute stage may cause fever, reduced appetite, and lethargy. During the subclinical stage, a dog may appear healthy despite an ongoing infection. Some dogs develop severe chronic disease involving bone marrow damage and abnormalities in blood cell counts.

Symptoms You Shouldn't Ignore

Weakness, fever, nosebleeds, pinpoint red spots on the gums, bruising, and pale gums warrant veterinary evaluation. You do not need to find a tick on your dog for ehrlichiosis to be a possibility.

How can you catch it early? Contact your veterinarian when your dog has unexplained changes in health or behavior. Diagnosis combines an examination, a complete blood count, and antibody testing or PCR. A positive antibody test alone does not prove active disease. Standard treatment is prescription doxycycline, usually for 28 days. Severe cases may require hospitalization and a blood transfusion. Diagnostic and treatment guidance.

Combining Prevention Strategies: Chews, Collars, and Topical Products

Bravecto, NexGard, and Simparica Compared With Seresto

The following U.S. price examples were checked on Chewy on September 16, 2026. Prices vary by weight range, pack size, and promotion. These examples are not a comparison of equivalent doses. In the United States, Bravecto, NexGard, and Simparica require a veterinary prescription.

Price sources on Chewy: Bravecto, NexGard, Simparica, Seresto. Duration of protection depends on the specific product: Bravecto, Seresto.

Oral products act after ticks attach and feed; products that repel ticks may reduce attachment. No product guarantees complete protection. Topical products differ in their ingredients and coverage, and owners in Israel should follow the Israeli product label. The original formulations listed above do not replace Spirocerca prevention. Combination products need to be evaluated separately.

Tell your veterinarian about any history of seizures before choosing an isoxazoline flea and tick medication. Most dogs tolerate these products well, but neurologic adverse reactions have been reported. FDA safety guidance.

Is your dog still scratching even though their parasite prevention is up to date? Read about dog allergies.

Frequently Asked Questions

My Dog Had a Spirocerca Injection a Month Ago. Is Infection Still Possible?

Yes. The injection is not a vaccine and does not prevent your dog from swallowing an infected beetle. Continue following your veterinarian's prevention plan.

What Is the Difference Between Vomiting and Regurgitation?

Vomiting usually involves nausea and abdominal contractions. Regurgitation is the passive return of material from the esophagus, sometimes without warning and not necessarily immediately after eating. Repeated episodes of either need veterinary evaluation.

Can People Catch Ehrlichiosis Directly From a Dog?

Ehrlichiosis is not spread by petting a dog or through ordinary contact. Infected ticks in the environment can transmit diseases to people, so managing an infestation around the home is also important.

Is the Injection Dangerous for Herding Dogs?

Not all herding dogs are at risk. The concern is genetic drug sensitivity and the specific medication being used. MDR1 testing and an individualized plan can help make prevention safer.

I Found a Tick. Does That Mean My Dog Is Sick?

No. Using fine-tipped tweezers, grasp the tick close to the skin and pull steadily. Do not crush it, burn it, or apply oil. Monitor your dog over the following weeks and seek veterinary care if symptoms appear.

Make Prevention a Routine With Vupo
Use Vupo's Care Index to set reminders based on the product and interval your veterinarian recommends, and record each treatment. Reminders help you stay consistent; they do not determine the medical protocol.

For more guidance, read Complete Puppy Vaccination Schedule and Preventive Care Guide and Dog Parks: A Guide to Safe Behavior on the Vupo blog.