Little Johnny walked into a police station one day

Little Johnny walked into a police station one day and said, "I've got three big brothers and we all live in the same room. My eldest brother has seven cats. Another one has three dogs and the third has a goat. I want you to do something about the smell." 

"Are the any windows in your room?" asked the officer. 

"Yes, of course there are!" said the boy. 

"Have you tried opening them?" 

"I can't...all my pigeons would escape."