What Does It Mean If Puppy Has Blood In Urine?

My daughter just got a 6 week old pitbull puppy a week ago.  It seems to be fine, but she called me today and said that the puppy is now urinating some blood.  This puppy has not yet had any vaccinations, could you tell me what this means if anything?

I just went through this and mine had a UTI, he put her on antibiotics and she is fine now. You need to take her to the vet because if that is what it is and it is not treated it will spread to her kidneys and then it gets bad and expensive to treat.

Blood in the urine, or haematuria, can be caused by urinary tract problems like infection, bladder stones, kidney disease, tumours, trauma, clotting disorders, congenital abnormalities or it can be associated with normal heat cycles.  
Other signs of urinary tract disease are straining to urinate, frequent urination, pain while urinating, foul smelling urine. 
Female dogs can have their first heat as early as 6 months.  Other signs of heat are attractiveness to male dogs, calling, swelling and redness of the vulva and raising the hindquarters.  Bloody discharge associated with standing heat in the female dog is the only situation where blood in the urine is normal, if this is not the case you will need to have your dog examined by a veterinarian to discover the underlying cause.
Your vet will take a thorough history of the problem, a full physical exam and do some preliminary tests including some simple urine tests, and blood tests.  Depending on the results, it may be necessary to do further testing to diagnose the underlying cause.  Further tests may include xrays, ultrasound, clotting profiles and urine cultures.

My 4 day old pup has a ting of blood in it's urine. It's been fine til today. It doesn't have any other symptoms & is eating really well! Please give me some advice!!