Sorry to hear that, I hope it has a nice afterlife in doggy heaven!
What makes me so angry though, is that when a dog is suffering, you can put it to sleep so it passes away peacefully. When it comes to an human being however, even though they're suffering... you can't let them pass away. Wheres the humanity in that? Surely, if its ok for a dog, it should be equally suitable to end a persons suffering?