I remember something similar with my cat. Went wrong quickly. No one would take him to the vet except me. It was hearbreaking. It was as if he knew. He panicked in the car and peed. He knew he wasn't coming back. His cries haunted me. I swore after that, no more pets. This was the second cat and the second dog I brought for execution. No one else would do the job.
My boys want a pet now. I won't be having it. Not going through that again.
I had to drive my mother's favorite dog on her fateful last day on this earth by myself to town, almost two hours away on the winter roads to the nearest open vet in the entire county on New Years day two years ago. Predictabley heartbreaking and saddening long drive to town and goodbyes before heading out, and if it was any other creature than my mum's favorite, then she would of likely gone for the trip or done it herself. Poor girl was old, lived a long life, most of it with us, we're pretty sure she was handed down to the pound we got her from by a breeder after having a couple litters. She had been recieving IV treatments for almost 6-months daily from us during her last months, her kidneys just couldn't take it anymore and we were up in the mountains at the family cabin for the holiday. It was just a horribley emotional winter that year for me and my family, was the first holiday after my Ex left, and how I was the only one with the sense and strength to of done the job, and by myself, I honestly don't know. I love my pets and do the best for them I can, suffer they will not, and they in return treat me with more love and respect than I've ever found in my own species.