Yes, there is phosphorus in dog waste. Does it contribute to algal blooms as claimed in this article? Apparently, yes, in some areas where dogs are pooping on

Yes, there is phosphorus in dog waste. Does it contribute to algal blooms as claimed in this article? Apparently, yes, in some areas where dogs are pooping on the edges of water ways. So not really applicable to most people and easily avoided by picking up your dog's waste. Which you should be doing anyway. It's not even a drop in the bucket compared to the fertilizer that's used on the lawn that dog is pooping on. And it's even less impactful than agricultural fertilizer use. And they want you to feed your dog vegan food because they're not obligate carnivores? I'm sure there is a way to do it, but I don't know of any company doing it well and even these unproven brands are stupid expensive.