Meningitis can be a scary diagnosis for any pet parent. While not necessarily common, meningitis in dogs is a potentially severe disease that can have debilitating effects if left untreated. Discover more in this article about the various types of meningitis in dogs, how to recognize its symptoms, diagnostic options, and what treatment options are available for your dog.
Understanding Meningitis in Dogs
Meningitis is a condition where the meninges, the protective layers around the brain and spinal cord in the central nervous system (CNS), become inflamed. In dogs, this inflammation can result from various infectious and non-infectious sources.
Identifying the root cause of meningitis in dogs is incredibly important as it will affect treatment and prognosis. However, inflammation of the meninges can lead to the breakdown of the blood-brain barrier, resulting in cerebral edema, vasculitis, and cerebral ischemia (restricted blood flow to the brain).
Infectious Causes of Meningitis in Dogs
Infectious causes include viruses, bacteria, fungi, protozoa, parasites, rickettsia, amoeba, and algae. Infectious causes of meningitis can be transmitted in two ways: direct penetration and hematogenous spread. Direct penetration can happen through bite wounds, severe inner ear infections, movement through the nasal cavity, or a contaminated spinal tap. Hematogenous spread describes how the virus spreads to the brain and spinal cord via the bloodstream.
Any dog breed or age can contract infectious meningitis. The German shepherd dog is predisposed to rickettsial meningitis and the American cocker spaniel is predisposed to cryptococcosis meningitis.
Non-Infectious Causes of Meningitis in Dogs
Meningoencephalitis of unknown origin (MUO) is the clinical term for noninfectious meningitis in dogs. It is a collection of immune-mediated or idiopathic diseases that affect the central nervous system (CNS).
Different Forms Of Meningitis in Dogs
There are different forms of meningitis, each having its own set of characteristics and breed predispositions. These forms include:
Steroid-Responsive Meningitis-Arteritis (SRMA): Often observed in young, medium to large breed dogs such as beagles, Bernese mountain dogs, Border collies, boxers, English Springer spaniels, Jack Russell terriers, Nova Scotia duck tolling retrievers, Weimaraners, and whippets. Steroid-Responsive Meningitis-Arteritis (SRMA) is the most common form of meningitis in dogs.
Granulomatous Meningoencephalitis (GME): Commonly found in middle-aged female small breeds, but it can occur in any age and breed.
Necrotizing Meningoencephalitis (NME): Primarily affects juvenile to young toy and small breeds like pugs, Maltese dogs, Chihuahuas, Shih Tzus, Pekingese dogs, and Papillons.
Necrotizing Leukoencephalitis (NLE): Occurs in dogs of any age, but more frequently in young, small breeds such as Yorkshire terriers and French bulldogs.
Greyhound Encephalitis: Affects young Greyhounds.
Eosinophilic Meningoencephalitis: Typically seen in young, large breed males, including Golden Retrievers and Rottweilers.
What are the symptoms of meningitis in dogs?
Identifying the clinical signs of meningitis in dogs is crucial for early detection and intervention. Although these signs may vary depending on the underlying cause, there are common indicators to be aware of:
Fever: Dogs with meningitis often have a higher body temperature than usual.
Widespread pain: Affected dogs can experience intense pain all over their bodies.
Neck stiffness: A stiff neck can make it hard for dogs to move or lower their heads.
Tiredness: Meningitis can cause dogs to become sluggish and low on energy.
Loss of appetite: Dogs with meningitis may not want to eat, showing little interest in food.
Interestingly, meningitis itself in dogs doesn't cause neurological symptoms. However, if it coexists with encephalitis, which is inflammation of the brain and what veterinarians term meningoencephalitis, neurological symptoms will be present. Such symptoms include seizures, blindness, circling and ataxia (lack of coordination).
How is meningitis diagnosed?
To diagnose meningitis in dogs, advanced imaging, analysis of cerebrospinal fluid (CSF), and testing for infectious diseases are used.
- Physical examination: Your veterinarian will start with a thorough physical examination, checking for signs like fever, neck stiffness, and pain. They will also assess the dog's overall health and gather information about the dog's medical history.
- Neurological examination: After the physical examination, the vet will perform a neurological examination to evaluate the dog's reflexes, balance, coordination, and other neurological functions. This helps determine if the issue is related to the central nervous system (CNS).
- Blood tests: Blood tests are performed to check for signs of infection or inflammation. These tests can help identify potential underlying causes and rule out other conditions that may present similar symptoms. Tick-borne disease screening via the 4Dx test should be performed as well.
- Cerebrospinal fluid (CSF) analysis: One of the most definitive diagnostic tests for meningitis in dogs is the analysis of cerebrospinal fluid, which is collected via a spinal tap or lumbar puncture. This procedure involves inserting a needle into the spinal canal to collect a sample of the fluid surrounding the brain and spinal cord. The sample is then analyzed for signs of inflammation, infection, or other abnormalities.
- Advanced imaging: In some cases, advanced imaging techniques such as magnetic resonance imaging (MRI) or computed tomography (CT) scans may be used to visualize the dog's brain and spinal cord. This can help detect any structural abnormalities or other issues that could be causing the symptoms.
How is meningitis treated in dogs?
Addressing meningitis in dogs relies on identifying the root cause and the intensity of the symptoms. After determining the diagnosis, your veterinarian will create a customized treatment plan to cater to the dog's unique requirements.
Let's take a look at a few usual treatment methods for managing meningitis in our canine friends:
- Antibiotics: In cases where meningitis in dogs stems from a bacterial infection, your veterinarian will recommend specific antibiotics to combat the identified bacteria. It's crucial to follow your vet's guidance and ensure your dog completes the full course of antibiotics, even if they seem to be getting better.
- Antifungal medications: For dogs suffering from meningitis due to a fungal infection, antifungal treatments will be prescribed to address the root cause. Depending on the severity of the infection, these medications might need to be administered over an extended time.
- Corticosteroids: To ease inflammation and pain related to meningitis, and to treat steroid-responsive meningitis, your veterinarian will likely prescribe corticosteroids, such as prednisone.
What is the prognosis for dogs with meningitis?
The future for our canine friends battling meningitis can differ significantly based on the underlying cause. Generally, dogs diagnosed with Steroid-Responsive Meningitis-Arteritis (SRMA) have a good chance of bouncing back. Those facing eosinophilic meningoencephalitis typically have a fair shot at recovery. Sadly, dogs enduring infectious meningitis, Granulomatous Meningoencephalitis (GME), or Necrotizing Meningoencephalitis (NME) often have a poor outlook. Moreover, dogs with Necrotizing Leukoencephalitis (NLE) face an extremely challenging prognosis.
To sum up, meningitis in dogs is a critical health issue that demands swift action and professional veterinary attention. By staying informed about the warning signs and symptoms, seeking a prompt diagnosis, and adhering to the recommended treatment plan, you can significantly improve your dog's prospects. If you think your dog might have meningitis or display any worrisome symptoms, consult your veterinarian for advice and assistance. Through early intervention and diligent care, we can provide our dogs with the best opportunity for a successful recovery. We hope this article helps!