Lab in heat, vomiting, squating with no urine

[LaneRanch]

My one year old lab is in heat for her second time. She does urinate and drink water but in between urinating she is squatting a lot and no urine comes out. I chalked this up to her being uncomfortable because of the heat cycle but now she is vomiting. She doesn't vomit everything she eats, but it's worrying me a great deal. Anyone have an ideas of what could be wroong? Is it possible that this is part of her heat cycle? I highly doubt pregnancy as she is closely watched and has not been exposed to any in tact or nuetered males.

[peekawho]

I echo Jaybay.  This is not part of being in heat.  As Jaybay said, this could be bladder stones that are now blocking her urethra, which is a dire emergency.  

I hope you took her to the vet.

[Jaybay]

This sounds like a possibly serious medical emergency.  It's nothing to do with her heat cycle.  I'm wondering if bladder stones are the culprit and are blocking the flow of urine.  That definitely is a life-threatening emergency, so get her to a vet NOW.

[have 2 kids]

We've had unspayed females for many, many years.   They have never vomited.   I would call your vet.