A dog infected with canine parvovirus (parvo) typically shows a cluster of symptoms that reflect how aggressively the virus attacks the gut and immune system. If you notice any of these signs, it’s important to contact a veterinarian right away, as parvo can worsen quickly and early care greatly improves outcomes.
Key symptoms that suggest parvovirus infection
Parvo symptoms usually appear 3–7 days after exposure and tend to escalate rapidly. The most common signs include:
- Severe diarrhea, often foul-smelling, watery, and sometimes bloody
- Vomiting, which may be frequent and difficult to control
- Lethargy or extreme tiredness — dogs often become weak and uninterested in normal activities
- Loss of appetite, refusing food or water
- Fever or sometimes abnormally low body temperature
- Abdominal pain — dogs may appear hunched or sensitive when touched
- Pale gums, indicating dehydration or blood loss
- Dehydration, often progressing quickly due to vomiting and diarrhea
- Weakness or collapse, especially in puppies with severe infection
Puppies may also show rapid heart rate, difficulty breathing, or low blood sugar, which can make them appear shaky or unresponsive.
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