Yes, all creatures on earth earn to be treated respectful. That’s one of the reasons why I dont eat cheap factory farm meat (and do eat very little organic).
Btw. Dogs are omnivores. And they can live on a vegan diet.
Cats are mainly carnivores, but a part of their diet can be vegetable . Much of the cat food in the shop contains pieces of vegetables and fruits. And some cats even choose to eat vegetable feed aside their special cat feed. Two of our neighbour cats like to eat the vegan feed of our chickens. They often come into the run to eat from it.
Btw: in general the animals in the meat industry don’t get anything but vegan feed in Europe. Because of the regulations after the sick cow disease and the use of unhealthy trash meat by the feed suppliers. Since a few years insects/worms are allowed for chickens.
The advice from our national institute (
https://mobiel.voedingscentrum.nl/nl.asp) for a healthy diet for humans is to eat no more than 80 grams meat in a day. Eating vegan or vegetarian (if balanced), is just as healthy. Eating (non balanced) vegan 3-4 times a week is causing no heath problems at all.
Just imagine how much animal abuse could be avoided if people would do so. Eating less meat is much better for the planet too. Because factory farming is responsible for lots of greenhouse gasses, pollution of the soil, water and air, and growing their feed uses lots of land. Growing so much soy and corn for animal feed is responsible for the taking down rainforests as well.