I quit eating mammals and poultry early this fall. It's mostly a secret. My husband knows, but I try to keep it quiet- people get really upset. I still eat the occasional fish (mostly sardines- much more sustainable) and if I'm a guest and I can't get away with skipping a meat dish I take a very small portion. I get my eggs from someone I know, but I eat eggs. I'm very lactose intolerant but I do eat a little cheese. And I'd never try to feed my cats that way- they're obligate carnivores, it's cruel. My dog actually does better with fish/veg protein, she's allergic to poultry and beef/lamb give her digestive problems (dog diarrhea is not fun).
My husband still eats meat, and that doesn't bother me- I still do all the grocery shopping, I still cook for him, I just don't eat it. My mobility problems are better, the eczema calmed down some, and our grocery bill is down substantially. He eats less meat now because I cook dishes (for me) that he tries and likes. The point isn't to "convert" him- he just isn't accustomed to veg dishes being enjoyable or palatable.
Really, truly, I don't care what you eat. I bought a couple pounds of bacon at Costco on Tuesday. I really, really don't care. Everyone has their own situation and their own shit to deal with. I did it because I have environmental impacts I don't control (a long commute I can't change), food intolerances (giving up meat helped my joint pain a lot and I'm less broken out and itchy), and an ever-increasing grocery bill.
I feel really powerless about all of those- I can't afford to move closer, I can't make my body stop freaking out, and couponing is usually only good for processed/packaged goods, which I don't buy in non-Costco quantities anyway. I make my own cheese, y'all. I garden as much as possible in a tiny lot. I draw the line at making my laundry detergent- that assumes my labor is worth nothing.