First, we'll figure out how many animals there are in total by adding up the cats and the dogs. In this case, we have 33+33=66 total animals. Then we need to figure out what fraction of these 66 animals are dogs:
[tex]\frac{33}{60}=\frac{1}{2}[/tex]
So half of the animals are dogs. To write that as a percent, we need the fraction to be over 100, so:
[tex]\frac{1}{2}=\frac{50}{100}[/tex]
50% of the animals are dogs.