Large Animal Veterinary
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Lots of things can cause fevers in pigs, including joint infections, stomach ulcers, endocarditis (heart infection), potentially even a tooth infection.
When pigs don't eat, they are very at risk for stomach ulcers. You can use some cool rags to decrease the fever for right now. Would be best to get the pig to the vet as soon as possible.
Is the pig having any other symptoms?
Poor piggie! I'm sorry I was away from the computer yesterday. How is she now? Aspirin is safe to use in piggies but it often does not help much with fever. There are NSAIDS that can be used in addition for fever that your vet can prescribe.
Give us an update when you get time!