my 1 yr. old lab mix has had one episode of blood in her stool over the winter.seemed to fix with pepto-bismol and rice. i have noticed very dark stool again and a night ago she vomitted what looked to me like blood and it was gel like but you would never know because she is a happy acting pup.i must tell you she has not been vaccinated but i plan on calling to make an appointment for that.. any ideas?? also she has a piddling problem. even if i dont call her like i am angry she cowers and pees.she has even done this with strangers.how can i stop this,it can be irritating. thank you