perrero – dogcatcher
pay-RRAY-roe; sustantivo masculino
El perrero recoje perros callejeros.
The dogcatcher picks up stray dogs.
It’s useful to browse your dictionary around a word to see the variations of it. The area around perro renders some interesting derivations, such as perra (bitch), perrada (pack of dogs), perramente (very badly), perrillo (puppy), and perruno (dog’s). You need not learn them all. Just read them to get a feel for them, and you’ll find yourself able to guess their meanings later from the root and the context of the conversation or writing.
Try this with calle to see if you can come up with the logic that leads to the formation of callejero, used in the example above.