Assuming it is a chainlink dog kennel (actually called a run). Openings in the chain link panels are large enough for small preds to get through , and predators like raccoons can reach through and bite off any chicken parts they can snag. You can remedy this by attaching 1/2" hardware cloth to the inside of the chain link panels at least to the height of 2 feet. That should take care of raccoon snatching. But if you have weasels and minks etc. they would climb higher or dig under.