Deworming my horse became easier by me just using something else in a syringe ie applesauce first then the dewormer.
Good article. I agree with cleaning the syringe and filling with something tasty--have you tried molasses? (I sometimes keep that to mix meds into feed so my horse cannot taste the meds. It's been awhile since I had to do that.) BTW, the horse afraid of a worming syringe is probably ALSO afraid of shots, so be careful! If you can relieve the fear of the worming syringe, it will help you with the other.