A lot of hedghogs are suffering due to the drought the country (or most of it) has suffered. Once they get run down and lose weight, they get ill. There are quite a few wildlife places who will be able to take this one for you. People feed them bread and milk, but apparantly they need cat food - or slugs etc
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As to disease, there is an old wives tale that hedgehogs carry TB .....and then suckle milk off milk cows lay in the fields.......how many cows would stand for a prickly hedgehog helping himself to milk?!!!! Otherwise, apart from fleas, which they have, nothing comes to mind that would harm other livestock. Just a thought - it could be flea ridden, and got sick through that?!!!