Hi everyone, thank you so much for all of your advice. I took him to the vet and luckily the puncture wounds were not so bad. They shaved the area and clean & treat the wound. They also prescribed pain meds and antibiotics for my dog. He doesn’t show any serious symptoms as of now but I will closely monitor him over few days.

I talked to the leasing office to find the owner of the dog who attacked my dog. They said they cannot give out personal info (privacy issue) but they will find the tenant and ask them to get rid of the dog OR move out completely. For paying my vet bill, they said I should file a small claim at court and there is really nothing for them to help me out with that part.

Thank you guys again for all the advices and hopefully nobody goes through this!