Here's my mutt Charlie, great dog but very anxious in a truck...you can drive cross country and she'll be on all fours the entire time watching the miles pass, always good company.
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Are you sure Charlie is a mutt? He (she?) looks VERY much like my Blue Lacy (if you've heard of those) "Lucy". Based on that photo...same size, same body structure, same ears/head/eyes, white chest badge. He just looks like a brown/brindled Lacy. Charlie is interesting looking.
If you know what Blue Lacy's look like....you know it when you see one.