Home sick

A conversation after returning to work from a sick day:

Co-worker: Are you feeling better? I heard you were coming down with strep or something.

Me: Yeah, feeling worlds better. It's amazing what a Z-pack will do.

Co-worker: Yeah, it seems to be going around the schools. Did you get it from your kids?

Me: [blink]

Co-worker: Oh, right. You don't have kids.

Me: No... but I have a dog.