Get a load of this distinguished gentleman

What do y’all think I’ve never seen a brown Aussie before especially as brown as this. I came across him at a Stockyard/flea market. Gentleman said he bought him for his kids and the kids weren’t doing anything with him. He’s quickly gotten used to me since when I bought him he was terrified and wouldn’t move when you set him down. Now he’s running around the backyard and playing with me. This is my first puppy and I couldn’t be happier. The last picture is how I found him he was in a kennel with 2 chihuahua mixes