In the UK rat traps (the sprung kind) can be bought from Machine Mart. Mind yer fingers!!

We tried peanut butter as bait but the critters are clever and won't touch it. They're coming through the spaces in our 2 foot stone walls and into the kitchen. We block each hole as it happens.
They're also in the attic and the unused chimney spaces.
Cat is one answer but the dogs wouldn't tolerate it, and anyway, like LtS, I like my tits too much.

Might try the mince & ground glass approach...I just want them outside, not inside.

Or I could buy another wolfhound....

Paws