It is a sign of improvement. When a dog suffers from parvovirus, his urine is thick and bloody. After treatment, the dog's urine turns yellow, no longer vomits, has normal defecation, and the body gradually regains its vitality. These These are all signs that the dog’s health is improving. Once the dog is found to be improving, the breeder should not relax and continue to treat the dog to make a complete recovery.