I have a black lab and she is three years old, she is now in here heat cycle and today I had her in the garage playing with her and she just all of a sudden urinated. I brought here outside afterwards and she urinated again. Anyone know what this could mean?

She may have a bladder infection. Please take her to a vet, and also please get her spayed. (She may already be having problems because she's not spayed.)

The most likely cause is that she is in heat. Female dogs urinate a lot more often then usual to "leave their calling card" so to say. The best way to cut down on this issue is to have her spayed, then you won't have to worry about the bleeding, excess urinating, or the risk of pregnancy, plus it is beneficial to her health.