Dihybrids!

So you know that easy peasy Punnett Square thing? Yeah, it gets harder. You can do it with two different traits, for example coat color and walking style.  So you could have a cross between something like CcWW x CCww and have to work it out. There are two ways to do this:
1. Huge, obnoxious Punnett Square: make a large Punnett square with each allele at the top of a column/end of a row, and then do it like you normally would.
2. Make a Punnett square for coat color and one for walking style.  Then multiply together your genotypic or phenotypic ratios (for example, here all of them would have the phenotype for big C, so 4/4, and 3/4 of them would have the genotype CC).  If you wanted to know how many of them had the phenotypes for C and W, then you would do 4/4*4/4 and get 16/16. Okay, bad example.  But still, it's actually pretty simple once you get the hang of it, although it is a lot of work (but what isn't?!)