Where's the other dollar?

I'm a Pastor so I have to be careful not to be too crass, but I have another math problem that has been passed down through 3 generations now.........Figure it out.........

There's this dog in Brooklyn.........He goes out the back door of the house, around a tree, and takes a dump......He then proceeds to another tree, and takes a dump......Not feeling purged, he goes around yet another tree then takes a dump.

Satisfied, he returns to the house.

Question.......... How does this equal 10?

(I can't believe I'm passing this on......)

As for the missing dollar, I know it's not missing......BUT...................