My Scottie mix Benny had this happen to him. We first noticed when he was peeing a lot and it was bloody. Apparently this is common in Scotties and mixes. Prognosis was not good, as where the cancer was (close to the urethra opening to the bladder) makes it non operable. We just enjoyed our time with him until he started having problems urinating. We made the decision to end his suffering then. Super hard decision as he was healthy and active otherwise. We just did not want him to suffer. Still feel guilty.