Why are most dogs and cats obese now?

According to statistics more than half of dogs and cats are obese.
The advice pet owners receive sounds familiar:
The irony is almost blatant as the prevalence of human obesity has also more than doubled between 1980 and 2014. The advice to pet owners correspond to the useless advice that people too are receiving: eat less, run more.
Both people and pets have received such advice while they’ve gotten heavier and heavier. Apparently the advice does not work very well for humans, which has been confirmed in studies. Calorie-fundamentalistic advice is likely just as ineffective for pets.
One tip is of course to start instead to give the pets what they are genetically designed to eat. The same thing works well on their owners.
What does your pet eat?
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Cats and Dogs Getting Fatter and Fatter
Our cats get a biologically appropriate raw diet: meat, chicken liver, chicken hearts, egg yolks, and some supplements (taurine, calcium, some vitamins), plus cream and butter as treats.
We have been feeding them a raw diet from day one (sort of a shock therapy, both of them used to eat kibble at the shelter).
The result: shiny, smooth coats, no more smelly poop.
Caution: Even a raw fed cat may become overweight, one has to consider that most cats are spayed or neutered. We feed about 2 percent of bodyweight/day/cat. Skinny cats and of course kittens may need much more.
But Diabetes in raw fed cats is unheard of, even if they are on the portly side.
Kibble is the worst because it is so high in carbs and low in moisture. Some manufacturers sell dry "prescription diets" for diabetic cats, what madness.
Recommended reading: http://www.catinfo.org (by US veterinarian Lisa Pierson), scroll down to the pictures of massively obese kibble-fed cats and to Obie, the poor tom with that painful urethral obstruction.
Also very recommendable: http://www.feline-nutrition.org
Keep up the good work!