Parvovirus is an extremely dangerous intestinal virus that destroys the
lining of the small intestines which results in malabsorption of food and
water and allows blood to leak into the intestines. This will lead to
weakness, dehydration and death (sometimes the virus also attacks the heart
muscle which is usually fatal).
Sounds like you are pretty much doing everything you can.
Just make sure that the vaccines are done routinely every year otherwise the protection may not always last the full time and will not protect fully.
Martin Slome DVM
Centre Street Animal Hospital
7700 Bathurst Street Units 40-42