Strange dog has made a habit of easing its waste at my entrance

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There is this strange thing going on at my gate and am not amused at all. I am in fact at wits-end on what step I should take. A seemingly stray dog has made a habit of easing itself at or next to my homestead entrance at least thrice a week. In the fast few days I covered the waste with dry soil or ash but I later on opted to removing it and disposing in a nearby pit. But I am ow finding the routine tedious and difficult. I have thought of placing poisoned food so that it is tempted to consume during its nightly visits and die, but again I feel so sorry for it – maybe it has innocent dependants. So I change my mind about getting rid of it. Despite making my entrance clean every day, the stray canine continues to dirty it with its waste. I have never found it in the process of easing, my be I could shout some sense at it and make it aware that whatever it does is unacceptable. What can I do to get rid of this situation without killing or harming the stray animal?