Well, it IS a chinese restaurant. Third world sanitary conditions are just part of the ambience of those places.
Enough complaints about sanitation can make their life even more difficult. Spray painting "why are all the dogs and cats disappearing in this neighborhood?" on the outside of the building would be appropriately droll, I think.
Poster on fb said son may be mentally challenged/ mental problems..and was just saying yeah yeah to cop phone call..doesnt change what father did