After ingestion, the lymphatic system serves as the replicating point for the virus, particularly around the throat. The bloodstream is then infected, and the virus begins attacking other lymphatic cells, the intestines, and bone marrow.
This causes weakening of the intestinal tissue, and so the separation begins to deteriorate, severely affecting digestion. Bacteria normally contained in the intestines is then allowed to flood the bloodstream, causing more problems.
Three or four days later, the virus will be in the dog’s feces, and this is when you can really notice the smell. If you wait this long before realizing the truth, however, it might be too late.
The dog parvo symptoms to look for in this case are the usual: vomiting, bloody diarrhea, and lethargy.
Get your dog to a vet immediately.