Despite the progress, the 21st century presents massive challenges for animal advocates:
Animal welfare is a science-based approach focused on the well-being of the animal. It operates under the premise that it is acceptable for humans to use animals for food, research, and companionship, provided that the animals are treated humanely and their physical and mental needs are met.
Issues like "puppy mills" and the abandonment of pets continue to strain the resources of shelters and rescues.
(sufficient space and proper facilities).