Baffled

OK, I am stumped, and looking for advice from other pet owners.

Wash got a new toy today. A well built, plush toy with squeakers (no stuffing). It's a great toy, and he loves it BUT every time he plays with it he whines like a baby.

My first reaction was "Well shoot, he must have an issue with his teeth. There goes all my $$." But he still chews on his chew bones, he plays tug of war with his rope, I checked out his teeth and mouth, no issue, no sensitivity.

Next I thought "Well, maybe he's constipated and it's uncomfortable to play." I touched his belly and felt no swelling, no bloating, and he had no sensitivity. Also, his next bowel movement was regular and right on schedule.

Now I'm completely stumped. I've done a complete tour of his body. He seems fine. When he plays with his other toys, he's silent. When he sees this one, he whines. He LOVES it and waves it around, chomps on it, drags it  across the apartment, but he whines the whole time.

Any idea why?

-Brandolyn