At Scottsdale Veterinary Clinic, we care deeply about the health and safety of your pets. One disease that often worries dog parents is canine parvovirus, especially when cases rise seasonally. Let’s explore why parvo tends to spike at certain times of year and what you can do to keep your furry family members safe.
What is Parvo?
Canine parvovirus, commonly called parvo, is a highly contagious virus that attacks a dog’s gastrointestinal tract and immune system. It spreads through direct dog-to-dog contact or exposure to contaminated feces, surfaces, or environments.
Puppies and unvaccinated dogs are especially vulnerable, and without prompt treatment, parvo can be life-threatening.
When Do Parvo Cases Spike?
In many regions, including Arizona, parvo cases tend to surge seasonally, with noticeable increases in:
- Late winter through spring
- Periods following rainstorms or increased outdoor activity
There are a few reasons for this pattern.
Why Parvo Peaks at Certain Times
1. Warmer Weather Encourages Outdoor Playtime
As temperatures warm up after cooler months, dogs spend more time outside, sniffing, rolling, playing, and exploring new terrain. That means more opportunities to encounter parvovirus particles lingering in soil, grass, and public spaces.
2. Moisture Helps the Virus Survive Longer
Although parvo is extremely hardy and can persist in dry environments, moisture and mild temperatures help it remain infectious in soil and shaded areas. After rain or irrigation, the virus can spread more easily across parks and trails.
3. Increased Social Interaction
Spring and early summer often bring more dog gatherings, visits to dog parks, boarding facilities, daycare, training classes, and group walks. More contact between dogs increases the chance of parvo transmission.
4. Young Dogs Are Out and About
Many puppies, the age group most at risk, are vaccinated and introduced to the world in spring and early summer. If their vaccination series isn’t complete, they may be more susceptible during this seasonal wave.
How Parvo Spreads
Parvo is typically transmitted when a dog ingests the virus from contaminated:
- Soil
- Grass
- Food and water bowls
- People’s shoes, clothes, or hands
- Surfaces at parks, kennels, or yards
Because the virus is shed in feces and can live in the environment for months, seasonal spikes often reflect behavioral and environmental factors rather than changes in the virus itself.
Signs Your Dog Might Have Parvo
If you notice any of the following, contact us right away:
- Severe, foul-smelling diarrhea (often with blood)
- Vomiting
- Lethargy or weakness
- Loss of appetite
- Fever or low body temperature
Parvo can progress rapidly, so early veterinary care can be lifesaving.
Preventing Parvo: What You Can Do
At Scottsdale Veterinary Clinic, we recommend:
- Up-to-date vaccinations — Puppies and adults alike need regular vaccines to stay protected.
- Avoid high-risk areas — Until fully vaccinated, keep puppies away from dog parks and communal spaces.
- Proper sanitation — Clean bowls, toys, and outdoor areas regularly.
- Prompt clean-up of pet waste — Helps reduce environmental contamination.
Vaccination remains the most effective way to protect your dog against parvo. Our team can create a tailored vaccine schedule based on your pet’s age, lifestyle, and risk factors.
Seasonal Awareness Saves Lives
Understanding why parvo surges seasonally helps you stay one step ahead. With smart precautions and a solid vaccination plan, you can enjoy Scottsdale’s beautiful outdoor lifestyle while keeping your canine companion safe and healthy.