I swear to God I'm going to start using these darn things as footballs!
While I have no problem with hedgehogs per se, they drive my dog mad
when they saunter into our back yard at night.

In the morning, I find "micro-craters" all over in the grass where the
dog has encircled the hedgehogs while barking and pawing at them.
Whether she's trying to eat the things or make friends I do not know,
but I've seen her pick them up in her mouth and carry them into her
kennel.

Short of creating a diabolical set of wooden obstacles that hang on my
iron gate, is there any household substance that might discourage a
hedgehog from visiting?