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Onychomys torridus
This little mouse was out in the daytime moving around and stopping to feed once in a while.
The little guy in your picture does look like a juvenile, doesn't he?! Very cool find! Hooray for carnivorous mice! :)
Emily, it looks very similar, even the short tail. This gray one is probably a juvenile that hasn't turned brown yet.
I'm really not sure about my suggestion, but it looks very similar to a grasshopper mouse!