I do not use Zimectrin Gold. Too many bad things happen with it that are NOT related to what I consider an acceptable response to a dewormer - which is mainly toxicity due to a large wormload being killed off. Burned lips does NOT fit that description :no:
I would ask my vet to do a little homework on that dewormer and then recommend another of that type.
Windswept and EqRider -- thank you for mentioning that. I will talk with my vet about it. She has a Morgan breeding farm, and it is run in a nearly identical way to ours, as far as worming practices, pasture management and such, so I know this is what she is doing with her own mares. But I will definitely talk to her about it!!
reading all of the responses the majority of posters which refer to strongid and ivermectin based products but when is everyone treating their foals/weanlings/yearlings for encysted worms? no one seems to mention it. Double dosing with strongid doesn't deal with encysted worms and neither does ivermectin nor panacur paste and those are the little blighters that usually cause the problems. :confused: