Our eight year old lab has been peeing frank blood on and off for over a year. He had loads of investigations last year (luckily on insurance - they forked out over £3,000!) and have found nothing. He becomes anaemic, but has iron tablets, then it stops for a few months. Has anyone heard of/had the same problem with a dog? Vets think now just treat anaemia. I don't really want to put him through loads of invasive tests again. He's otherwise fit, well, full of energy, shiny coat etc.