They are in their summer coat which is less furry and makes them look skinnier. They need less fur in the hot weather. Once winter approaches their fur will be much thicker or fuller looking.
This is one of three fox kits. It was stretching a bit which makes it look skinny. These fox kits are harmless and tame. I have enjoyed their antics over the last month or so. They denned at the same location last year too.