I suggest then that you find a holistic vet and work with them. Have them do some fecals and blood work on your birds and dogs, then come up with a plan to treat whatever they have. After treatment, repeat lab work, and publish your results.
BTW, if you think a "God-given" plant can't be any worse than chemicals developed in a lab, I think you need to do more research, 'cause I can think of *many*.
Let me tell you some stories...
Many years ago, when I had my horses at a boarding stable, tree companies used to bring in their ground up tree trimmings for people to use as bedding. A new batch came in one day, the next day there were six dead horses!
Last year a farm in CA lost 20 horses from feeding 1st cutting alfalfa. Cause of death was a weed in the hay.
Oleander... I didn't have her necropsied, but I think I lost a calf to oleander poisoning.
Rhubarb, Avodado, Apple Seeds, the list is quite long. Have you ever seen the list of God-given plants that can be toxic to birds? I guarantee you, that when used properly, the types of chemical wormers that I use are safe.
-Kathy