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.
I know there is some stuff that can't be given to animals, but that doesn't mean "scientically proven" medications and the like are any better. I guarantee you, that garlic and ACV are safe. I've used it on my chicks for 6 weeks, and the rest of my flock for months, and none of them have died from it, gotten worms, or any other illnesses. Fecal tests are the only way to convince you, but my experience proves to me, that many natural remedies are safe, and affective. They are a lifesaver to have around. Other people can decide if they want to try it or not. I'm sorry about your horses.
I bet you're one that thinks if you don't see worms in the poop, that they don't have worms. Only worms that are easily seen are roundworms and tape segments, but more often than not, one will not see worms if their bird has them.
There is no way that you can know how safe and/or effective feeding garlic and ACV is without proper labs tests and a control group.
Edited by casportpony - 4/3/16 at 12:40pm