I also wouldn't deworm without a fecal test - though I know some members do it on a schedule. Sometimes one or two of my ducks will have unacceptable levels of parasites and the other ducks don't.I don’t mind having sample tested , I just have to find it and call my vet to see if she is willing, had a heck of a time finding a vet willing to do my “box duck” when her leg was broken
When I asked my vet about a worming schedule she said what Isaac said - that it would create parasites resistant to the medication. She also added that the medication itself has side effects and that we don't want to use it more than necessary.
Hopefully you don't have internal parasites. I just thought it was worth mentioning because of her soiled appearing bum.
