chicken can't walk, but no visible injuries after attack!

[Rocksannc]

My hens and roosters were attacked by a dog and one of the hens looks good on the outside but she hurt her leg and I have no idea what to do to help her get up and moving again.. It seems to be sprained or pulled muscle because she can walk but she is limping. No visible swelling but i'm afraid of her laying around all the time. She will drink water but I can't get her to eat. Please help!!

Sincerely,

Rocksannc