It is sometimes normal if they have been pregnant for a while.
yes
I don't know about a pregnant dog, but urine leakage is a sign of diabetes, get a bottle of diastix glucose test strips and test her urine.
Yes
The kidney is "designed" to 1) not leak proteins and 2) to reabsorb any that do get into the urine.
Yes. Reasons are few though, if they leak more than a drop or two then perhaps you are undergoing an hormone imbalance, otherwise it happens to some women which should be normal and it lasts two to three days. Better yet see a doctor to be sure.
Usually concentrated because of dehydration
No, it's not normal to have blood in your urine during your period. If you are using external menstrual products like pads, or internal products like tampons or softcups that can leak, then blood lingering around the vaginal opening or vulva will be washed off by urine as you urinate and so there will be blood in the toilet bowl. If there is blood in the urine itself, not from menstrual flow, then it is a sign of a urinary tract infection (common if you use commercial menstrual pads such as Always or Kotex) and you should talk to your doctor.
You'd have to give birth to young first before you produce or leak milk.
Blood in the urine with a UTI occurs due to inflammation and irritation of the urinary tract lining, which can cause small blood vessels to leak blood into the urine.
Yes. However your breasts are leaking Colostrum or pre-milk and not breastmilk. Breastmilk doesn't arrive until a day or two after the baby is born.
It's probably colostrum, or "pre-milk." It's not just common; it's normal. Not sure why you notice it at night, though. It could be your sleeping position.
It is not normal for subcutaneous fluids to leak out of a cat. If you notice this happening, it is important to consult a veterinarian for proper evaluation and treatment.