Hedgehog invasion

Ok folks, please don't laugh at me. Some people have problems with mice on their yards, some people have problems with rats on their yards. I have problems with hedgehogs My yard is fenced with only few small gaps under the gates. Cats can't get in there but hedgehogs (even big ones) manage to get in there. My dogs are on chains and as a result they meet together, often. This ends up with a mess, thankfully only in the evenings so far, when I am at home and not sleeping. So I hear the noise and manage to get there before any irreparable damage is done. Though last night I've found some blood on the hedgie and dog's muzzle. The dog almost managed to unroll the hedgie so it was lucky that I got there just in time! Didn't find any big wounds on any of them though and hedgie was let free away from my property. But this annoys me. Not only my dogs damage their muzzles without a reason, I also worry for the hedgies. I like them and don't want any of them to be killed by my dogs! And this types of accidents happen often! So my question is, have any of you any experience in keeping hedgehogs away from your yards?
Picture below is one of the hedgies rescued from one of my dogs...

 

i would start by sealing all the gaps in your fence

 

Sealing fence made of corrugated metal sheets?? No gaps in the fence, one gap only under gate for the car! And that gate needs to open sometimes. But those little monsters manage to squeeze through that small gap...

 

Never had a hedgehog problem, I don't think i've ever seen one in person lol. Maybe you can set some traps? I hear they like cat food and mealworms. I'd probably keep one as a pet