How do I deal with dwarfs illegally mining my territory?

Buy some gremlins for security. They can be troublesome too so make sure you train them good. They don't require too much maintenance. Easy to care for. You could get goblins but I wouldn't recommend it on account of their potential kleptomania if not looked after at all times.
 
Flood the floor of their fortress with alcohol and cats and wait for the cats to kill themselves with alcohol poisoning after licking the alcohol off their paws then the dead cats will lag their fortress out so bad they'll probably decide to self destruct in a hilarious and over the top way you can enjoy rather than attempt to continue life at 5 fps.
 
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