Mixed Measurement

The other day Anya was on the bed with her stacking dolls, very carefully taking them apart and then fitting them back together. Paxton bounded into the room and hopped up on to the bed, brandishing a little stopwatch that he'd been playing with. "Okay Anya," he declared, "let's time you! How long does it take to put your dolls together?"
She started. He clicked the button.
When she finished, Paxton held the watch high. "Good job, Anya!" he said looking carefully at the numbers, "fourteen pounds!"
Andrea about fell off the bed.
They did it again.
"Two pound-animals!"
Is that better?
"Mommy?" Paxton asked, very seriously, "How do you stop this thing?"