Rabbits do not menstruate. If unspayed females start passing blood, they can bleed to death within a few days. Blood in the urine can also be a sign of bladder stones.

What age do rabbits get periods?

Female rabbits in heat

As with male rabbits, female rabbits will reach sexual maturity very soon. There are variations in a female rabbits first heat period, but it can start between 4 - 6 months of age. It also is maintained throughout their life cycle, also with periods of heightened or lessened sexual activity.

Why do bunnies bleed?

Sedentary rabbits, female rabbits, and middle-aged rabbits are all at risk of developing hematuria. This may be due to kidney stones, bacterial bladder infections, and/or an increase of calcium in the blood. The most common cause of hematuria in intact females, however, is the dysfunction of the reproductive tract.