The key to safe chickens is a sturdy, impenetrable coop. Raccoons should be more of a concern, they are such clever, determined critters. .Make sure the structure is secure (enclosed top, fencing buried below ground under the sides, secure latches on doors or other entryways), keep all birds locked in at night, letting them out into the run or “tractor” only during the day. Cats have always been interested in birds, but with a healthy respect for chickens–Dogs will chase the birds, if they are left to roam. If you let your birds out, please keep them under supervision at all times.