How about adding this event into "the alley" with a few changes,
pet the rat=> if you pet it you ingulf a misfortune upon you
you start to become very sick -10% hp for 20 rounds each time
Feed the rat=> you feed it and it bites you and you start to feel woozy -10% hp for 10 rounds
Kicking the rat=> you kick the rat but it does nothing to you
or (addition option) it wakes up very sick like but it lunges at you and bites you
Level [player's level +1]
HP 200-500
attack [level + DK]
defend [level + DK]
each time it attacks its hp suffers 20 damage due to its sickness
winning gain 5% exp and 500 gold
but since it bit you you start to feel sick
-10% hp for 30 rounds