Penny
That Sam guy is right. Anon frequents two places only: Namukkun Cafes and the vet clinic. That narrows it down to only two people: Sunny and Kimmy. Sunny has a dog and the last post mentioned something about being at the clinic with her dog. Kimmy, of course, is a regular at the cafe and the bar and she's been mentioned in posts twice which could be fake alibis.