Oh, Ash, I had no idea.
I am so sorry that it had to happen this way, but ultimately it was up to your parents.
I know you are hurting, and it is painful, but I just KNOW Chewy is at the Rainbow Bride enjoying himself--it was the best decision for your family.
I hope Chewy finds Spike, my parents' beagle from when I grew up, he'll show him what to do, and introduce him to my grandpa, who will shower him with affection.