I’d be distraught too; I can’t imagine how it’s like seeing a beloved companion in distress like that.
Years ago I had a dog friend, mixed breed, 3yo and 100 lbs that got choked on an what was left of her leather chew and she couldn’t breath at at all. I did the heimlich on her – took 3 times because I was so nervous I didn’t do it right at first. I quickly calmed down and did it right, the chew popped out and she was fine. One of the most emotional experiences of my life, I needed a Jack and coke after that and she acted like nothing happened. We were friends for a long time. Amazing what we can accomplish when we have to.