I am sorry you and your fur baby had to endure this! This would have happened to my Goliath, oddly on the same night. That was a very evil day! Maybe our story will help you see that the vets are not always helpful either. My poor boy had been struggling the weekend before. On Monday, he couldn't even greet me in the morning. I laid next to him and began to cry, getting scared I could lose him. But as our minds tend to do, pushed that thought out of my mind! Goliath couldn't leave! He is, after all, the baby of our three. That afternoon he was really struggling again. I laid next to him again and this time noticed a huge mass on one of his legs. I called the vet and rushed him in. They said he had a bacterial infection and sent us home with an antibiotic and a pain med. Said to come back in 2 weeks. He didn't make it another 2 weeks. By that Friday, Goliath was struggling to breathe. He was constantly panting and attempted to get up and get a drink. He just kept moving his feet in front of him, moving his head from side to side. I called the vet and took him back in again. This time they told me he was suffering from Congestive heart failure, liver and kidney damage, was in diabetic stress (never diagnosed as being diabetic!) in respiratory stress, was anemic, and very pale. They rushed him to the oxygen room. Came back in to show me his x-ray, which revealed a very enlarged heart. He was literally being suffocated to death. He would need 24-hour care but probably wouldn't make it through the night. They also didn't provide that and I would have to take him to the next city. But she didn't think he would make it there. I was devastated! I had to make the gut-wrenching decision to put him out of his misery. That is not an easy choice! After getting the euthanasia, we were sent home with his body. I unwrapped him after we got home so my kids could say their goodbyes. This is when I realized Goliath was still breathing. Even after being euthanized, Goliath remained warm and slightly breathing for 10 hours. An emergency vet phone line told us we would have to bring him back in the next morning for another injection! Like right!! I had already been traumatized! Praying maybe by some miracle that he may survive, he passed on his own around 4 a.m. Odd time isn't it? Since this has happened, I have learned that the pain med they gave him may have been the culprit. I hope this isn't the case for your Samson but after reading about the pain med they gave Goliath, I learned its highly controversial with a known side effect of causing death. They are supposed to do lab work prior to prescribing it, which they did not. They are not supposed to prescribe it to any dog who has any known heart issue. My Goliath had a heart murmur, as well. At the very least, they are supposed to hand out a fact sheet that informs of you of all side effects. They only told us that it could cause diarrhea. I don't know if this helps assure you that sometimes we just don't know, we are always thinking our pets are here forever, and that sometimes vets cause more harm than good. I will pray for your pain, as I am grieving myself and completely understand! Life is so unfair sometimes!
Missing my baby boy Goliath....A little heartbeat by my feet