I'm not a EnviroNazi, or anything close. But as someone that has 3 dogs and a cat, just letting that anti-freeze run on the ground is not a great idea. I know that it creates a lot of problems, because now you need to somehow collect all that waste fluid out of the cooling system. Anti-freeze causes kidneys, animal and human, to start forming crystals that shred the organ. A very painful way to go, from what I understand, and anyone that has had kidney stones can appreciate.
Not telling anyone how to do anything, but just a consideration.