What Is Valley Fever in Pets and When Is Urgent Care Needed?

A dog that develops a persistent cough, fever, tiredness, or trouble walking after spending time in a dusty or dry environment may have more than a simple respiratory illness. Valley Fever in pets is a fungal infection caused by Coccidioides organisms found in certain soils. Dogs are affected more often than cats, and symptoms can range from mild respiratory problems to more serious illness involving other parts of the body. At Antigua Veterinary Practice, St. Augustine, FL, pet owners can discuss concerning symptoms with a veterinarian and determine whether further evaluation is appropriate. Knowing the warning signs can help you recognize when Valley Fever may require prompt veterinary care.

What Is Valley Fever in Pets?

Valley Fever is a fungal infection caused by Coccidioides organisms that live in soil. Pets can become infected when they inhale fungal spores stirred into the air by dust, digging, construction, or other soil disturbance. The infection primarily affects the respiratory system, but in some pets, the fungus can spread beyond the lungs.

Key facts about Valley Fever:

• It is caused by a fungus.
• Dogs are commonly affected.
• Cats can also develop the infection.
• Spores are found in soil.
• Dust can carry the spores into the air.
• Infection usually occurs through inhalation.
• Some pets develop only mild illness.
• More serious cases can affect multiple body systems.

Valley Fever is most commonly associated with certain regions of the southwestern United States, particularly areas with dry soil and dusty conditions.

How Do Pets Get Valley Fever?

Pets generally become infected by breathing in microscopic fungal spores.

Exposure can happen when a pet:

• Digs in dry soil
• Runs through dusty areas
• Sniffs disturbed ground
• Plays outdoors during dusty conditions
• Investigates construction areas
• Walks through areas where soil has recently been disturbed

Dogs that spend a lot of time outdoors may have more opportunities for exposure. Valley Fever is not generally spread directly from one pet to another. The primary concern is environmental exposure to the fungus.

What Are the Signs of Valley Fever in Dogs?

The symptoms can vary depending on whether the infection remains in the lungs or spreads elsewhere.

Common respiratory and general signs include:

• Persistent cough
• Fever
• Low energy
• Reduced appetite
• Weight loss
• Rapid breathing
• Difficulty breathing
• Exercise intolerance

Some dogs may appear generally unwell rather than showing one obvious respiratory symptom.

If the infection spreads, signs may include:

• Limping
• Painful joints
• Swollen joints
• Back or neck pain
• Skin lesions
• Enlarged lymph nodes
• Eye problems
• Neurological changes

A combination of respiratory symptoms and bone, joint, skin, or neurological changes deserves veterinary evaluation.

What Are the Signs of Valley Fever in Cats?

Cats can develop Valley Fever, although the disease may look somewhat different from typical cases in dogs.

Possible signs include:

• Skin lesions
• Swelling under the skin
• Enlarged lymph nodes
• Weight loss
• Reduced appetite
• Fever
• Low energy
• Respiratory problems
• Eye abnormalities

Skin-related changes may be especially noticeable in some infected cats. A cat with unexplained lumps, wounds, swelling, or persistent illness should be examined by a veterinarian.

When Does Valley Fever Require Urgent Care?

Valley Fever may require urgent veterinary care when a pet develops significant breathing difficulty, severe weakness, neurological changes, collapse, or rapidly worsening symptoms. A persistent cough alone may not mean your pet needs urgent care, but breathing difficulty or major changes in behavior and strength should not be ignored.

Seek prompt veterinary attention if your pet develops:

• Difficulty breathing
• Very rapid breathing
• Severe weakness
• Collapse
• Seizures
• Loss of coordination
• Severe confusion
• Inability to walk normally
• Significant eye problems
• Severe pain
• Rapid deterioration

These signs can indicate a more serious disease or another condition requiring immediate evaluation.

What Is the Difference Between Mild and More Serious Disease?

Valley Fever can affect pets differently.

Disease Pattern	Possible Signs	Level of Concern
Mild respiratory disease	Mild cough, reduced energy	Veterinary evaluation recommended
More active respiratory disease	Persistent cough, fever, appetite loss	Prompt veterinary care
Bone or joint involvement	Limping, pain, swollen joints	Veterinary evaluation
Skin involvement	Lumps, wounds, swelling	Veterinary evaluation
Neurological involvement	Seizures, confusion, coordination problems	Urgent veterinary care
Severe respiratory disease	Significant breathing difficulty	Urgent veterinary care

Symptoms alone cannot confirm Valley Fever. Testing is needed to determine the cause.

How Is Valley Fever Diagnosed?

Veterinarians may use several pieces of information to determine whether Valley Fever is a possibility.

The diagnostic process may include:

• Medical history
• Physical examination
• Review of environmental exposure
• Blood testing
• Fungal testing
• Chest imaging
• Additional testing based on symptoms

Your veterinarian may also consider other causes of coughing, fever, weight loss, lameness, or skin changes. This is because Valley Fever can resemble other illnesses; identifying the underlying cause is important before deciding on treatment.

How Is Valley Fever Treated?

Treatment depends on the severity and location of the infection. Antifungal medications are commonly used when treatment is appropriate. The length of treatment can vary, and some pets require extended monitoring.

Treatment planning may involve:

• Antifungal medication
• Monitoring of symptoms
• Follow-up examinations
• Repeat testing when appropriate
• Nutritional support
• Management of pain or other symptoms
• Monitoring for recurrence

Medication should be given exactly as prescribed.

Do not stop treatment early simply because your pet appears to feel better. Your veterinarian will determine when treatment should be adjusted or discontinued.

Can Valley Fever Spread to a Pet’s Bones or Brain?

Yes. In some cases, the infection can spread beyond the lungs.

Possible areas of spread include:

• Bones
• Joints
• Skin
• Eyes
• Lymph nodes
• Nervous system

When the nervous system is involved, a pet may develop seizures, confusion, balance problems, weakness, or other neurological changes.

These symptoms warrant prompt veterinary evaluation.

Hypothetical Example: A Dog With a Persistent Cough

Imagine a young dog named Scout who spends a lot of time outdoors and develops a cough that does not go away. A few weeks later, Scout becomes tired more easily and begins eating less. Instead of assuming the cough is simply seasonal, Scout’s owner schedules a veterinary evaluation. The veterinarian considers environmental exposure along with other possible causes and recommends appropriate diagnostic testing. This hypothetical example shows why persistent symptoms should be evaluated rather than automatically attributed to a minor respiratory problem.

Can Valley Fever Be Prevented?

Completely preventing exposure can be difficult in areas where Coccidioides organisms naturally occur.

However, reducing contact with heavily disturbed or dusty soil may help limit exposure.

Helpful precautions include:

• Avoid letting pets dig in dusty soil.
• Keep pets away from active construction areas.
• Limit outdoor activity during heavy dust.
• Avoid areas with large amounts of disturbed soil.
• Monitor pets that spend significant time outdoors.
• Contact a veterinarian if persistent symptoms develop.

Prevention is particularly useful for pets living in or traveling through regions where Valley Fever is more common.

Can Pets Recover From Valley Fever?

Many pets can improve with appropriate veterinary treatment, but recovery depends on the severity and extent of the infection.

Pets with disease limited to the respiratory system may have a different outlook from pets with infection affecting the nervous system or other organs.

Recovery may depend on:

• How early treatment begins
• Location of infection
• Severity of disease
• Overall health
• Response to medication
• Whether the infection has spread

Follow-up veterinary care is important because symptoms can change over time.

What Should You Do If Your Pet Has Persistent Respiratory Symptoms?

A cough that continues for several days, especially when combined with fever, reduced appetite, weight loss, or low energy, deserves veterinary attention.

Keep track of:

• How long has the cough lasted
• Whether it is getting worse
• Appetite changes
• Energy levels
• Breathing rate and effort
• Weight changes
• Exercise tolerance
• Any limping or neurological changes

This information can help your veterinarian understand how the illness is progressing.

When Should You Seek Urgent Veterinary Care?

Not every Valley Fever symptom requires urgent care, but certain changes should never be ignored.

Seek urgent veterinary care if your pet has:

• Difficulty breathing
• Severe respiratory distress
• Collapse
• Seizures
• Severe weakness
• Loss of coordination
• Inability to walk
• Sudden severe confusion
• Severe eye abnormalities
• Rapidly worsening symptoms

If your pet is struggling to breathe or suddenly collapses, seek veterinary care immediately.

Conclusion

Valley Fever is a fungal infection that pets can develop after inhaling Coccidioides spores from contaminated soil and dust. Dogs are commonly affected, while cats can also develop the disease, sometimes with skin or other unusual signs. Persistent coughing, fever, appetite loss, weight loss, and low energy should be evaluated by a veterinarian, particularly when they do not improve. More serious symptoms such as breathing difficulty, seizures, collapse, severe weakness, or coordination problems require urgent veterinary care. Call us at 904-824-1414 or schedule an appointment with Antigua Veterinary Practice, St. Augustine, FL, to evaluate concerning symptoms and determine what diagnostic and treatment steps may be appropriate.

FAQs

Q1: What is Valley Fever in dogs and cats?
A: Valley Fever is a fungal infection caused by Coccidioides organisms found in certain soils. Pets usually become infected by inhaling fungal spores carried in dust.

Q2: What are the first signs of Valley Fever in dogs?
A: Early signs can include coughing, fever, low energy, reduced appetite, and weight loss. Some dogs may later develop lameness, joint pain, skin problems, or neurological signs if the infection spreads.

Q3: Can cats get Valley Fever?
A: Yes. Cats can develop Valley Fever, although their symptoms may differ from those commonly seen in dogs. Skin lesions, swelling, weight loss, fever, and respiratory problems can occur.

Q4: How is Valley Fever treated in pets?
A: Treatment commonly involves antifungal medication when Valley Fever is confirmed or strongly suspected. The treatment period and monitoring plan depend on the severity and location of the infection.

Q5: When should my pet with possible Valley Fever receive urgent care?
A: Seek urgent veterinary care if your pet develops significant breathing difficulty, collapse, seizures, severe weakness, loss of coordination, inability to walk, or rapidly worsening symptoms.