Vegan dog help

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Hi guys, I don't post here often but I need some advice on how to keep my dog vegan without it having health problems.

I've gone through 3 new dogs in almost 10 months now and I'm getting a 4th but I'd like to get some advice on diet. My other dogs I'd feed them twice a day solid meals of carrots, rice, potato, collared greens and seasonal fruits which they all seemed to like. I'd mix in almond milk or soy milk sometimes with it too so it was even healthier.

But for some reason they all kept getting thinning coats and two of them broke bones before I had to dump them and a couple other problems. I eat pretty much the same thing and I'm probably the most healthy person I've ever met, do dogs not work the same way?

Thanks for any help guys!