I regularly watch a hedgehog squeeze under my neighbour's fence which appears to go all the way to the ground. It must be a pretty tight squeeze cos you can hear all it's wee bristles scratching against the wood - but 2 seconds later it pops up on the other side and merrily carries on it's way.
you are so lucky to have a hedgehog in your garden -they are getting quite rare now so please do what you can to encourage it to keep visiting you - I'm soooooo envious. Don't feed it rubbish (sorry jomifl) and maybe visit a hedgehog advice site..... lucky, lucky you -
I agree, do all you can to encourage it, we are lucky enough to have four this year, they love meal worms and peanuts which won't encourage other cats. We also have a hedgehog house but none of them have chosen to live in it yet. We do get one fox that likes to sleep in the dog kennel (our dog never uses it) even in the daytime sometimes!
If it is a teeny tiny hedgehog you will need to keep an eye on it. They start hibernating mid November and if they are less than 700g they are too little to hibernate. I had a couple like this but I only noticed them because they were out in the daytime (which is bad). I ended up taking them to the local vet who looked after them but you could take yours to twiggywinkles.