Pet nutritionist here: I recommend foods like this one for short periods of time (8-16 weeks) to start fresh with zero animal proteins then introduce them back one at a time when having a hard time figuring out what protein a dog could be allergic to. It’s a helpful tool, but most (qualified) people wouldn’t recommend this long term. I’m sure some people who eat vegan / vegetarian use it that way but it’s not the intended use of this food as created.