My guinea pig very ill. I don't believe is assisted death.

[Tom 1]

My guinea pig Edmund has a tumour on his underbelly and he has also developed a problem called mallocussion which means his teeth have overgrown making it very hard for hime to eat and drink.
He is losing weight rapidly and seems to gasp to air.
The vet said it could be put down but I don't think it is right as it's essentially euthanasia and I don't want to decide my animals death.
The only other possibility would maybe have his teeth filed down every 6 weeks for the rest of his life but that is very expensive and maybe not worth it if he has a tumour.
Please help and pray. Edmund is in pain.

My basic take on this is that animals shouldn’t suffer, as they experience suffering in the same way that we do. What they don’t have is the same self awareness that we do, not in the same existential sense that makes us think about our own existence and fear death. For that reason I don’t believe ending the suffering of an animal in pain is comparable with ending the life of a person.