Update DELAWARE PET UNIVERSITY (62 Albe Dr Newark, DE 19702 United States )

I am absolutely a wreck but I’m hoping someone can help me with figuring out my next move.

On August 16 I dropped my healthy dog off for a 3 week board and train to get some help with his anxiety and aggression. The trainer was sending us videos and giving us updates and everything seemed fine. Fast forward to August 21 I received a call from my local pet hospital that my dog was dropped off dead. The facility never reached out to tell us that anything was even wrong. They also left us with the hospital bill. The hospital had to advocate for us to get them to pay the bill. They refuse to refund us our money or even tell us what happened. We were able to speak to someone ONCE and his answer was “stuff like this happens”. I am in shambles over this and don’t know what to do from here. My fear is this happening to another dog.

Can I sue? How do I report them? Does anyone know a lawyer or the process for this?