Of course, Pope Francis, like the rest of us, surely believes that ill-treatment to any of God's creatures surely is against God's will. Whether animals have rights or not, surely they deserve to be treated with mercy and kindness, gratitude and sympathy, respect and admiration. Who in their right mind can be against humane care and treatment of creatures Well, evidently it depends.
Consider some examples of what happens to animals in research laboratories.
Cats, dogs, nonhuman primates, and other animals are drowned, suffocated, and starved to death.
They are burned, subjected to radiation, and used as "guinea pigs" in military research.
Their eyes are surgically removed and their hearing is destroyed.
They have their limbs severed and organs crushed.
Invasive means are used to give them heart attacks, ulcers, and seizures.
They are deprived of sleep, subjected to electric shock, and exposed to extremes of heat and cold.
Every one of these procedures and outcomes complies with every federal law everywhere. Each conforms with what federal inspectors count as "humane care and treatment."