Best Doormat for Sand/Dirt?

Hey all! I have a 6-month old Staffy / Boston Terrier mix and he loves going out in my fenced-in backyard to run around. He enters/exits through the mudroom that leads into my backyard - but that doesn't mean I actually want mud back there! LOL. I live in Florida, and my yard is a mix of sand, dirt, and grass. I don't mind that he rolls around and has fun, but he's tracking the sand/dirt all throughout my house. I heard there are some doormats that help with this issue, but was overwhelmed by all the options/choices I found on Amazon. Can anyone recommend a brand they've used, or possibly another solution I haven't thought of?

Thanks!

Amy + Beau