Schnauzer puppy carries toy and cries - why?

by Ginny
(Missouri, USA)

Our 5-month-old Schnauzer puppy has begun picking up one of her soft toys and running around the house crying.
Her tail is wagging as she does this, but she won't come to us.
This often happens after a meal or when we return home and she first comes out of her kennel, but sometimes it just happens out of the blue. It is not always the same toy.
I have wondered if it is excitement or if her teeth are hurting. My vet and a trainer have never heard of this.
Any ideas?