If you do slow kill just keep their nutrition good... Never be late on the pills. Every 29 days. Pills last longer if dog is negative but a positive dog shouldnt be an hour late. Keep extremly close eye on him.
I supplimented and supported my dogs immune system with high grade essential oils(only ones labeled for ingestion and not store bought) and food grade diotomaciouse earth (NOT pool grade)also.
We did slow kill with our husky and he was clear and tested negative about 2 years later but it can take much longer. Just depends on what stage they are in.
It has risk but so does fast kill. 4951