Have a neighbor cutting grass and dumping all his grass cuttings in back of property, that is, next to my property..
Is this going to be health hazard or draw for animals, mosquitoes, bugs, snakes, ticks, etc.? I am thinking that with rain and heat it is going to start smelling moldy and mildewy. He is dumping cuttings on weeds and wild growth from open land in back of the houses. There is a lot of wild life in area. Ground hogs, snakes, fox, rabbits, squirrels, deer, chipmunks, etc. Pile of cutting is getting pretty high and across entire back.
We understand your concern, but we don't think there is much to worry about with the grass clippings being used as mulch and weed suppression. Piled grass clippings are usually quite wet and dense and not a draw for habitat for the type of animal life you mention. And grass clipping should not emit much odor as they decompose.
Consider it a good thing that he is recycling and using mulch to suppress unwanted growth, instead of herbicides.