I hope you get this, I just picked up Ivomec Injection 1% for my chickens & the person working in the store mentioned how well it works on dogs and cats. I cannot find a clear answer on how much to dose them. I have 3 cats, two at 14 lbs and one at 9 lbs. Thanks you if you get this!
Your ivermectin 1% needs to be diluted, I would suggest a 20 to 1 ratio. Ivermectin is not soluble in water so people use food grade propylene glycol, glycerin or mineral oil. If you're applying topically I would suggest mineral oil, especially since propylene glycol is toxic to cats.
So 20 parts mineral oil, 1 part ivermectin 1%. There's a company called JR Enterprises that sells 60ml bottles of pre-diluted ivermectin for $25 a bottle. I don't have any affiliation with this company other than I've used this product, but I would suggest it rather than the 1% ivermectin solution.
1ml of 1% ivermectin solution contains 10,000 micrograms of ivermectin. This is why people overdose their animals, this is way high a dose. You only need a fraction of this. At a 20:1 dllution, 1 ml will give you 500 mcg, .1ml (1/10ml) gives you 50mcg. Shake well.
For dogs, for heartworm, the suggested dose is about 50mcg of ivermectin per 10 pounds of body weight. So for my spaniel mix, I'll want to give him about .4ml of the diluted ivermectin for heartworm orally. For my 70 lb lab, I'd give her .7ml. Some people want the doses a bit higher for heartworm so around 1ml for the spaniel, 1.5 ml for the lab. It's bitter so I squirt it on some plain yogurt or lowfat cottage cheese, they lap it up.
Now this is dose for heartworm. For ear mites, for mange doses are different. For injected ivermectin, dosages are diferent. For cats, I don't know. For fleas I don't know if it kills them. For fleas, I use a generic form of imidacloprid, you can buy it from DYI pest control places. Again you have to calculate the dose but that's pretty easy.
Back to cat ear mites. I'd try .1ml (1/10ml) of the diluted in each ear. For fleas ... try .2ml on the shoulders. Let us know if it works.
For snake mites, squirt .5ml (half a mil) of the 1% ivermectin (undiluted) in 1 liter of water. Shake shake shake each time you use (remember it's not soluble in water). This you can mist directly on your snakes and in their enclosures. Do so daily for a week or two or until mites are gone.