I went to the feed store to get something to worm my 2 young goats, and all they had basically was the apple flavored ivermectin oral paste for horses. It is 1.87% ivermectin, and it has warnings about being for use on horses only. Can this stuff be used for goats? And also, they weigh about 40lbs each. How in the heck would you measure out this goop that's in a syringe type dispenser? It is graduated in 250lb increments. Thanks in advance for any advice.