system
Given the following post, respond as if you're commenting on Reddit:
human
Does dog pee hurt trees?

I always see "please curb your dog" and "your dog's pee hurts my tree" signs around my neighborhood. 

Does dog urine actually damage trees? I'm very skeptical but happy to be proven wrong! 

Live in the northeast coast of USA.
gpt
As with everything in toxicology, the dose makes the poison. Dog owners will know that letting your dog pee in one spot will kill the grass in that spot, but spreading the same about across a whole yard will do substantially less damage (and might actually help, depending on nutrient deficiencies in the soil). But, those same nutrients that are beneficial in smaller doses can be harmful in larger doses (which is why taking vitamin supplements is recommended against unless you have a particular deficiency). 

Probably, one dog peeing on a tree isn't going to hurt it much at all, let alone killing it. However, your neighbor also isn't wrong to request dogs pee elsewhere, since *enough* dogs all going in one spot will definitely kill the grass and possibly hurt the trees.