What is shortening your animal’s life span, often at an enormous financial cost?

Dogs used to live until they were 20+ years old, cats 28+ years old, and horses 40+ years old. Vets were never needed in the numbers they exist today. Ask anyone born in the 1950’s or earlier, if they ever went to the vet with their animal? They answer “no”, there was never any need. Why is every being on this planet dying younger, and younger? The answer, man-made driven toxicity and lack of questioning. The questions therefore must be: What is your animal’s toxic load? What imbalances is this driving? And how are we all perhaps contributing to this?