[acreature]

Taking the Dog is a Felony.... if the neighbor stole it.

If the neighbor used the maintenance personel to gain entry just to steal the Dog, that is Felony Breaking and Entering, unless it was at night, which makes it Burglary (Felony)

As far as a duty to help... that falls civilly upon Police Fire and EMS, or others trained in First Aid.

If just the Neighbor, I am not aware of any Obligation to render assistance UNLESS it is a vehicle collision....( I could just be unaware of any) But, civilly there may be grounds... best to speak with an Attorney about that... especially about the Maintenance Personnel opening the door at the request of a neighbor.

Hope your Mother is doing better.