Here is one issue: https://www.newscientist.com/article/2307320-dog-waste-may-harm-nature-reserve-biodiversity-by-fertilising-the-soil/ https://www.newscientist

Here is one issue: https://www.newscientist.com/article/2307320-dog-waste-may-harm-nature-reserve-biodiversity-by-fertilising-the-soil/ https://www.newscientist.com/article/2307320-dog-waste-may-h... They also cause problems for nesting birds, most notably for ground and hedge nesting kinds.