A local animal shelter recorded the number of dogs and cats that were adopted or not adopted last month, as shown in the table below. If a pet is selected at random from those recorded last month, what is the probability that the selected pet is a cat?
| Dogs | Cats | Total | |
|---|---|---|---|
| Adopted | 12 | 18 | 30 |
| Not Adopted | 5 | 10 | 15 |
| Total | 17 | 28 | 45 |
