Since we came back from our hunting trip, he hasn't been eating much. He limps around everywhere and it seems like he's feeling under the weather. He seems warmer than usual and he doesn't play all that much anymore.
He should be up to date on his DAPP and rabies shots!
It sounds like Lyme related symptoms. What vaccines have Billy gotten, if any?
It's important to keep your animals vaccinated not only to help them prevent and fight infections, but also to keep yourself safe from possibly harmful diseases that they can spread.
I'd suggest giving Billy the Lyme vaccine. It gives your pet the antibodies necessary to fight Lyme and its symptoms.