Indy does it when she has a rask chew, I think 'cos they're quite big, she gets halfway through, then want's something else - a drink, a pee, a poo, a walk - but she can't bring herself to leave it.
So she runs around with it in her mouth, puts it down, picks it up, puts it down, hides it in her bed, picks it up, runs round whinging with it in her mouth, I usually have to take it off her and put it somewhere high until she's sorted out what she wants.
It drives me mad, but it's very comical.