I have a 80 pound plus Boxer that I bought this collar for. We live out in the country and he likes to go out on our 25 acres and explore. When it is tick season he always gets the corn ticks on him. We live in the NE and it is not flea or tick season at the present so not sure yet is it will work but I will update in the spring. The collar I bought is a large (17″-20″) and it fits him perfectly. It is very stylish and goes great with his fur color. .Easy to put on and does not pull or snag at his fur. Like that it is 100% natural and you do not have to worry about allergies, breastfeeding , or pregnancies. All handmade and put together well. Has a nice leather buckle. I have 5 dogs that like to play together and it has held up to their “roughhousing”. I received this product at a discount. All my reviews are based on my own experience and evaluation of the product so that others can benefit in finding quality products that meet their needs & expectations.