deer aren't the only creature that eat spent grains.

[Northbound]

Brewed yesterday and dumped the spent grains in the yard, last night I turned on the spot light and saw a red fox chowing on the mash with five deer in the back round waiting for their turn at the table.

This morning the grains were gone. This winter must be a hard on those creatures.

[Big K]

You need to set yourself up a trail cam. I'd bet you find more than deer and fox eating your spent grains.