You can't do this?
This is the fundamental principle of any IB or AP biology class!
Step one is to assess the problem. What are you trying to accomplish? Why? Assess the situation, and think critically: If you are trying to test the effects of a new product, perhaps it would be best to compare it to similar pre-existing products in order to more effectively market it to potential buyers?
Set up a hypothesis.
Develop a series of steps: Will you test the absorption of a set amount of fur? How are you defining thickness? Does the color of the coat cause a visual difference in thickness (it can and does in many cases)? Etc.
Think critically. It isn't difficult by any means. If you're dealing with the thickness of small objects, you'll need a device to look at and measure small objects. If you're dealing with an objects ability to absorb water, use a scale and water as a starting point.
As a warning: if you care to continue in biology classes, you must begin to think creatively and critically. Soon, you will have assignments that are more along the lines of, "Design a lab that has to do with cellular respiration." That open-ended-ness which makes it seem so easy is really where the difficulty lies, because you're dealing with a huge field. In this case, the scope of your project is limited to testing the effects of a product on two variables. Try to think of all factors, present your lab to other people who think very differently and ask them to heavily criticize it. You don't want to hear "good job", you want to hear "this lab is very flawed in every sense of the word," assuming the latter comes with a set of examples as to why. There is no such thing as the "perfect" lab, but the closer you get, the better.
