What's That Bug? does not endorse extermination

What on earth is this?
I would love to know what kind of caterpillar or larvae we found our dog playing with. I’ve never seen anything like it. It’s about 4 inches long and about 3⁄4 inch in diameter.
Thanks for your help

This one took a bit of research. Seems the color phase is a little unusual. This is the caterpillar of a Northern Ash Sphinx or Great Ash Sphinx, Sphinx chersis chersis. We located some information on Bill Oehlke’s great site.

What's That Bug? does not endorse extermination

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