A kit is considered to be up to 4 months old, 5 months old to a year old is a juvenile and considering itās may and kits are generally born in march-April and judging from its size and coloring this little guy is probably around 3 months old so it would still be considered a kit.
By the looks of him. I suppose "juvenile" would be a better term. He's not fully grown yet, but he's almost there. If you Google pictures of a juvenile red fox, you'll see lots of resemblance :)
Just google coyote and you will see images of an animal that doesnāt look like this. Then google red fox and you will see images of this animal.