I’m glad to hear that things are looking up so far - fingers crossed your dog pulls through! I know just how heartbreaking losing a dog is.
As for your question, if the worst were to
happen, I would definitely tell your daughter, regardless of where she is. By not saying anything, although your intentions are good, you are essentially depriving her of a chance to say goodbye on video, to see her dog one last time, alive and wagging his tail. I’m sure it would break her to come home to these news and then finding out that you kept it from her.
Perhaps this is too much info, but I wanted to share this with you. When we lost our family dog to cancer back in 2019, I had just lost my job and was at home with him. Our dog had bone cancer and we made the decision to amputate his leg to save his life as he didn’t have mets anywhere else. He was fine for about a year, went back to his puppy self and adapted really well to life on 3 legs. Unfortunately, a year later, he developed tumours in his lungs and another on his optic nerve, so he was now blind in one eye, but there was a chance the lung tumours would shrink with chemo so we wanted to give him a fighting chance because he showed will to live/eat/play/cuddle etc. One Monday, we went to see a specialist vet to discuss surgery to remove his eye to ease his pain, we booked the surgery for Friday that week. On Thursday, day before the surgery, he took a turn for the worst and could not get comfortable, he was poorly and in pain and it broke me. I was only 20 at the time and it was the most heartbreaking decision I had to make. I called my entire family back home from work so we could all have a chance to say goodbye to our boy. I’m pretty sure my family would not forgive me if I did not call them and give them this chance. We put him to sleep that same day and I’m so thankful that we all got to hug him one last time. Before he laid down for sedation, he gave everyone one last kiss and tail wag, like he knew he was ready to go. We held him as he took his last breath.
I know your daughter might not be able to see your dog in person, but I think she would be very grateful to be able to see him one last time and say goodbye.
Anyway, I have my fingers crossed for your dog, all the best 🤞🏼