hi last week i noticed alot of blood on my dogs bed.i took him to the vet the same day and vet said he had a cut on his nipple that was infected and gave antibiotics and said the bleeding should dry up if not come back.the cut did dry up but when my dogs was playing he would knock it and it would pour with blood again.i took my dog to the vets today to get the nipple cut off as it was not healing.i have just had a phone call from the vet to say it was not actually a cut but it was a lump that he must send away for tests.i am now very worried.as anyone else experienced anything like this.the lump was just bleeding a little bit it was pouring with blood.my dog has been fine still eating playing etc...

Think I would change my vet. Sorry to hear about your dog and hope it will recover soon.