If the thighs are average sized, you can split one between them. Make sure they aren't enhanced, sometimes those frozen ones are. Sodium should be less than 100mg per 4 ounce serving.
An average meat meal for a 5 pound dog would be about 2 ounces.
"Having heard all of this, you may choose to look the other way.....
but you can never say again that you did not know." William Wilberforce 1759-1833