I've been using for 20+ years 1%, dogs between 60-85lbs get 1/2cc.
Vets will say not to use becuse it is off label use.
But did have a 35lb english setter with mange(got her that way)she got 2cc a day for 12 days,cured the mange and she is still alive at 12.
And as far as saving money it is alot more that 5 bucks,I get a 50ml bottle for around 35 bucks it will do 10 dogs for a year.
It will never be fda approved for dogs just cost to much money and they sell lots to us that have cows,and buy it by the gallon.
ANd this was the pour on you used? Just making sure.