Prologos said the following:
"re animal suffering: in the natural world, In predation, the animal would be dead before the numbing effect of the hormones that are triggered by terror wear off."
How would you explain the injustice of allowing countless species to go extinct?
"In all my terror moments, falling 18 feet at age 80, going under a truck with my motorcycle at age 20, even cutting my leg with a saw, and so on, I never felt any initial pain."
Not all animals are killed instantly.
You have only offered a defense for a 'quick kill' scenario.
"The question of the cancerous dog, in the natural world it would be quickly identified and devoured because of it's weakness, before chronic pain would set in."
That is a weak excuse.
If we were to kill everyone with incurable cancer, as soon as they were diagnosed so they did not suffer, would that be a just and loving solution? Especially if you had the power to cure them.
Bear in mind the animal has no choice in the matter.
"Seconds of terror possibly painless,-- to pay for years of joy? a fair bargain."
Many animals do not even get years to live.
Possibly painless?
Depends on the scenario.