Hi. Keeping her age in mind, it looks like her first heat. You can get Vaginal Cytology done to confirm the same though but to rule out any problem with urine, you need to get her checked by a veterinarian along with urine analysis.
There's no problem while throwing urine she's all well with having proper diet and playing games and all, maybe it looks like her first heat... Is there something to do in it .I mean what to do ?we've to use diaper or something?
Yes. You’ll need to manage the discharge around the house while your dog goes through her heat cycle. You can use diapers and keep changing at an interval of 5 to 6 hours until she stops bleeding.