A daily routine; a female wolf urinates to defend the pack’s territory. Other ways to defend it are putting scent on trees, stumps, stones and bushes, and by scaring away (or when needed killing) intruders.
Both breeding male and female mark, subordinates do not unless vying for dominance. Both male and female raise a hind leg during urine-marking, although the male raises his higher, possibly in keeping with his anatomy.
Picture by Lynn M. Stone, scanned from the book ‘Wolves’ by Daniel Wood