so sorry for your loss
, is that photo in your display picture him? beautiful dog, 11 years, thats how old my sheltie was when he died of old age,its shocking when you expect them to live for longer,i'm sure you did nothing wrong, and you shouldn't blame yourself, i'm betting that posionous frog did permanant damage to his system that went unnoticed, and at least you got to wake up and see him for the last few moments, he wasn't alone, he had you.