We've all been there. You're having a lovely stroll. Just walking somewhere. You see some nice trees, wave high to people and... wait. What's that smell? Oh, no. Somebody just let their dog go number 2 and just kept walking. Just ignored it. Wow. You'd think in today's society where tobacco is banned nearly everywhere, restaurants have to use special kinds of fats and oils, that we'd be more concerned with something like having poop all over outside. Yes, certain cities have adopted a "law" making it so you have to clean up after your dog. But, honestly, have you ever seen a cop come racing up to a steaming pile of dog poo, and try to find the perpetrator? Laying a chalk line around it and roping off the scene? Okay, that is a bit far. But the point is that even though it is a law, people still do it, and nobody cares. Kind of like Jay-Walking or failing to yield at a crosswalk.
There are signs all around that say "leash and curb your dog". So what does "curb your dog" really mean? It doesn't have anything to do with a curb actually. Curb is used as an actual verb here. There's your English lesson for the day. To curb is to "lead (a dog) off the sidewalk into the gutter so that it can excrete waste." You really gonna make Fido squat over a curb? Just bag it, dispose of it, and move on. But what if it's pee?
Purdue University is doing a lot of studies on animal urine and the damage it can cause. Dog pee is the elimination of all water soluble toxins and overall bad stuff and has an excess of concentrated salts. Coming from Minnesota, I know how much salt can damage the grass growing along roads and walkways. It is not just salt that does the damage though. It also is the acidity. Particularly in female dogs, acidity levels are high enough to cause damage to bushes, grass, small trees, and even large trees over a long period of time.
So, if you care about your surroundings, then yes, you have to watch where your dog pees.