Hello all. My puppy is about 17 weeks old. At her last vet check up on April 24 we were told she had dermatex mites and given Ivermectin to give to here increasing the dose every three days. My concern is that it seems to be getting worse. Does anyone know if it getting worse means the medicine isn't working or does it just take time for the medicine to start and everything to heal. The vet also said that as she matures her immune system will be able to fight off the mites. Is this true or is this going to be a problem I'm going to be fighting forever???