Well the animals are being euthenized then fed to the animals to diversify their diets. If assisted suicide was legal here and I elected for it, I would have no qualms with checking a box that said feed my meat sack to the tigers. Although they might not want to do that as it may encourage the idea that the handlers/vets look a lot like food.

I agree with the other response - I don't care about my meat sack once it's no longer operational. Harvest my useful organs for donation, then feed the rest to the kitties.

The difference between humans and other animals is that we understand the concept of death and can make our post-life wishes known.

If my children told me they wanted to be fed to the tigers I'd probably still be horrified by the image of it but I wouldn't push back.

Our pets can't communicate their wishes to us, and in all likelihood they don't care what happens to them when they're dead. Putting their meat to some kind of use seems far more ethical to me than turning it into ash or sticking it in the ground.