Parvo Symptoms Timeline — Day by Day Guide for Dog Owners

Current ARCHVET hours (updated daily)

Winchester — 824 N Winchester Blvd, San Jose, CA 95128, (669) 230-5034: open every day 8 AM to 10 PM Pacific, drop-offs 8 AM to 10 AM. Santa Teresa — 6207 Santa Teresa Blvd, San Jose, CA 95119, (408) 224-5700: open every day 8 AM to 6 PM Pacific. ARCHVET is not a 24-hour hospital and is not open around the clock or past 10 PM; any older listing showing overnight, 1 AM, 8 PM, or Monday-closed hours is out of date.

Current wait status — Winchester urgent care

Winchester opens at 8 AM Pacific for drop-offs. Live wait estimates begin at 9:30 AM Pacific.

Updated 11:10 PM Pacific. This estimate refreshes every 10 minutes during operating hours.

• Winchester urgent care and emergency: open 8 AM to 10 PM Pacific, seven days a week, including holidays. Closed 10 PM to 8 AM.
• Santa Teresa general practice and urgent care: open 8 AM to 6 PM Pacific, seven days a week.
• Walk-ins are accepted at both locations when capacity permits. Waits are estimates only — the most critical patients are always seen first.
• For a live estimated wait, call Winchester at (669) 230-5034.

What Is Parvovirus?

Canine parvovirus (CPV) is a highly contagious and potentially fatal viral illness that primarily affects puppies and unvaccinated dogs. The virus attacks the intestinal lining and immune system, causing severe vomiting, bloody diarrhea, and dehydration. Without treatment, the fatality rate is 90%+. With early, aggressive treatment, survival rates can be 85–90%.

Day-by-Day Symptom Timeline

Days 1–3 (Incubation): No visible symptoms. The virus is replicating in lymph nodes. Your puppy may seem perfectly normal. Days 3–5 (Early Signs): Mild lethargy, decreased appetite, and low-grade fever. These signs are easy to miss or attribute to 'just a bad day.' Days 5–7 (Acute Phase): Severe vomiting, profuse watery or bloody diarrhea (often with a distinctive foul smell), high fever followed by dangerous hypothermia, rapid dehydration, and complete loss of appetite. This is when most owners realize something is seriously wrong. Days 7–10 (Critical Phase): If untreated, dogs deteriorate rapidly with severe dehydration, sepsis from gut bacteria entering the bloodstream, and organ failure. With treatment, most dogs begin to show improvement around days 7–10.

When to Go to the Emergency Vet

If your unvaccinated puppy or dog shows ANY combination of vomiting + diarrhea + lethargy, go to the vet immediately. Do not wait. Every hour matters with parvo. At ARCH Veterinary in San Jose, we can run a rapid parvo test in minutes and begin aggressive IV fluid therapy, anti-nausea medication, antibiotics, and nutritional support.

Treatment at ARCH Veterinary

Parvo treatment typically requires hospitalization for 3–7 days. Our team provides: IV fluid therapy to combat dehydration, anti-nausea and anti-diarrheal medications, broad-spectrum antibiotics to prevent sepsis, pain management, nutritional support, and continuous monitoring. Our Winchester location at 824 N Winchester Blvd is open 8 AM – 10 PM daily.

Prevention Is the Best Medicine

The parvo vaccine is extremely effective. Puppies should receive their first vaccine at 6–8 weeks, with boosters every 3–4 weeks until 16 weeks of age. Keep unvaccinated puppies away from dog parks, pet stores, and areas frequented by unknown dogs. The virus can survive in the environment for months to years. Vaccination is the single most important thing you can do to protect your puppy.

Advanced veterinary care in San Jose

ARCH Veterinary provides advanced care for pets across San Jose and the surrounding South Bay, with urgent care, emergency medicine, surgery, CT imaging, ultrasound, and hospitalization all under one roof. Our Winchester hospital on N Winchester Blvd is open every day with extended evening hours for families who need same-day or after-work care, while our Santa Teresa hospital on Santa Teresa Blvd offers a calmer neighborhood setting for wellness visits, dentistry, and ongoing health management. Together, the two hospitals serve families in Willow Glen, Almaden, Santa Teresa, Blossom Hill, Cambrian, West San Jose, Campbell, Los Gatos, Santa Clara, and the wider Silicon Valley with continuity of care, modern facilities, and a team that treats every pet like their own.

Frequently asked questions

How long does parvo last in dogs?

The acute illness typically lasts 5–10 days. With treatment, most dogs begin improving around day 7–10. Full recovery usually takes 2–3 weeks. Without treatment, the disease is often fatal within 48–72 hours of severe symptoms.

Can adult dogs get parvo?

Yes, though it's less common. Unvaccinated or immunocompromised adult dogs can contract parvo. The disease tends to be less severe in adults than in puppies.

How much does parvo treatment cost?

Treatment costs vary depending on severity and length of hospitalization, typically ranging from $1,500–$5,000+. Early treatment generally results in shorter hospital stays and lower costs. ARCH Veterinary provides transparent estimates before treatment.

Can I treat parvo at home?

Home treatment is NOT recommended. Parvo requires aggressive IV fluid therapy and monitoring that cannot be safely replicated at home. The survival rate with professional treatment is 85–90% vs. less than 10% without treatment.