Nature is what it is, not what you want it to be.

You have got to be joking. Well, no, I know of any number of dimbulbs who would attempt the same thing - and some have, though it was regular vegetarian, and with dogs. Didn't go well for them, either.

Insane.

The horrific case at a North Melbourne animal hospital has prompted a warning about the dangers of people "forcing ideologies" on their pets.

Lort Smith Animal Hospital veterinarian Leanne Pinfold said the kitten was brought in this month by its owners, who were believed to be vegan. [ed - You don't say.]

She said the kitten's diet of potatoes, rice milk and pasta had caused it to become critically ill.

"It was extremely weak and collapsed when it came in. It was almost non-responsive," Dr Pinfold said.

The kitten was given fluids via a drip, placed on a heat pad and fed meat.

"Concern for animal welfare has to include a biologically-appropriate diet," she said. "You can't force your ideology on the cat."

 Momma always told me, stupid is as stupid does.