Time To Eat The Dog?

According to a New Zealand study conducted by some environmentalists people, a medium-sized dog has twice the carbon footprint as a Toyota Land Cruiser.
They compare how much it takes to feed the dog against how much it takes to feed the truck.
After that last sentence we should probably just stop here.
But, we'll go on.
The study also targeted  the environmental evil of cats.

Through important scientific calculation, that takes 0.84 hectares to feed an average dog, and 0.15 for a cat. If our math is correct, that makes a dog worth about six cats, or about five Volkswagen Golfs.

The message here is what?
Don't feed dogs and cats?
Eat dogs and cats?

New Zealand-based authors Robert and Brenda Vale said their findings are based on the amount of land needed to grow food for pets ranging from budgerigars to cats and dogs.
Mr Vale, an architect who specialises in sustainable living, said: "There are no recipes in the book. We're not actually saying it is time to eat the dog.
"We're just saying that we need to think about and know the (ecological) impact of some of the things we do and that we take for granted."
He explained that sustainability issues require us to make choices which are "as difficult as eating your dog".
Mr Vale added: "Once you see where cats and dogs fit in your overall balance of things, you might decide to have the cat but not also to have the two cars and the three bathrooms and be a meat-eater yourself."