That truly is appalling! I'm so sorry to hear about your dog and your mum it must have been a horrible experience for you both I know if that happened to Cher (My dog) I would have been distraught. I can't believe nobody helped you in such a state reading your post made me just want to track them all down and give them all a good slap people are so self absorbed nowadays. I hope your dog pulls through it all and your mum to give her my condolences and you too.
Stay strong