Was that necessary? - 14 years ago

My three year old dog had an appointment at the vet today to get a booster shot. Along with the shot is a physical exam. Now I haven't had a problem with this vet before, but I was bothered by what I saw maybe because this was the first time that this happened in the room with me present. To get samples of urine and fecal matter the plan proposed was to extract via needle from the bladder