Radar is Irving’s pet dog. He is obviously a Very Good Boy, though we don’t know nearly enough about him (breed, real name, trainer, studio affiliation).
It’s believed that Radar’s name is a reference to Irving’s connection with the US Navy, or a M*A*S*H reference.
Based on my research so far, I believe Radar is a variant of Mountain Cur (3), possibly a Tennessee Treeing Brindle (4) but that's a newer sub-type of the breed, so maybe a little less likely. I think the TTB has the looks, though. The name could be a MASH reference #Severance pic.twitter.com/moTgvWgnXi— Too 🌐 (@TooOftenOdd) May 6, 2022