Weil’s disease in dogs: Symptoms, prevention, and treatment

Weil’s disease in dogs is a serious infection caused by the Leptospira bacteria. Dogs are at extra risk especially during warm months, for example when they swim in stagnant water. Because leptospirosis can also be transmitted to humans, it is important to recognize the symptoms quickly and prevent infection.

What is Weil’s disease?

Weil’s disease is a well-known form of leptospirosis, a bacterial infection with potentially serious consequences for both dogs and humans. It is a zoonosis, which means the disease can pass from animals to humans. Fortunately, cats are almost never infected.

The bacteria mainly settles in the kidneys and liver. Without prompt treatment, this can lead to permanent damage. That is why it is important for dog owners to be alert, especially if their dog likes to swim or drink from puddles.

How does a dog get infected with leptospirosis?

Dogs usually contract Weil’s disease through wild animals such as rats and other rodents. These animals carry the bacteria without getting sick themselves. The bacteria enters the environment through their urine.

Infection often happens when a dog:

• swims in stagnant water

• drinks from puddles or mud pools

• comes into contact with infected urine

• eats from carcasses

• is bitten by a rodent

Sunlight kills the bacteria relatively quickly. Dark, damp places therefore pose a greater risk.

Symptoms of Weil’s disease in dogs

The first complaints can arise suddenly and worsen quickly. Therefore, pay close attention to changes in behavior or health.

Common symptoms include:

• high fever

• lethargy

• reduced appetite

• vomiting and diarrhea

• muscle and joint pain

• neurological abnormalities

In severe cases, dogs can develop kidney or liver failure. With kidney problems, dogs often drink and urinate more than normal. Liver problems can cause jaundice, visible as a yellow discoloration of the mucous membranes and skin.

With the right treatment, many dogs can recover. However, without treatment, leptospirosis can be fatal.

Diagnosis: how does the vet determine leptospirosis?

The vet can detect Weil’s disease with a blood test. An infected dog produces antibodies against the bacteria, and these are measurable in the blood.

A quick diagnosis increases the chance of recovery and reduces the risk of other animals or people becoming infected.

Treatment of leptospirosis in dogs

Leptospirosis is treated with antibiotics. Often, supportive treatment is also needed, such as admission to the vet and an IV drip.

Always finish the full course of antibiotics. If treatment stops too early, the dog can remain contagious for months.

Sometimes a second course is needed to fully combat the bacteria.

Prevention: how to protect your dog

Vaccination is the most effective way to protect your dog against Weil’s disease. Annual vaccination is strongly recommended.

For several years now, there has been an improved vaccine that offers protection against four variants of the bacteria instead of two. If you switch to this vaccine, a booster after four to six weeks is necessary for optimal protection.

Extra tips to prevent infection:

• do not let your dog swim in stagnant water

• prevent your dog from drinking from puddles

• avoid areas where rats are present

• be extra alert during warm periods

Can humans get Weil’s disease?

Humans can become infected through an infected dog. Good hygiene is therefore essential when your dog is sick.

Pay particular attention to the following:

• avoid contact with urine

• wash your hands thoroughly

• ensure a clean living environment

Symptoms in humans range from flu-like symptoms to serious health problems. In rare cases, the infection can be life-threatening.

Conclusion

Weil’s disease in dogs is a dangerous condition, but it is easily preventable with the right precautions. By being alert to symptoms, avoiding risky situations, and vaccinating your dog annually, you significantly reduce the chance of infection.

Are you unsure about your dog’s health or do you recognize symptoms? Then always contact a vet immediately. Acting quickly can make all the difference.