i think this might help....
Female Dogs in heat
Sent to Dog Experts April 30, 2005 9:45 a.m.
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Can a female dog have pain and unusual behavior during her first heat cycle?
Customer (name blocked for privacy)
Status: Closed Value: $5
Info Request
April 30, 2005 9:59 a.m. (13 minutes and 58 seconds later) REPLIED to Info Request
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What kind of pain and unusual behavior are you seeing?
Tammy F. -- Dog Care Expert -- 99% Positive Feedback on 2181 Dog Accepts
15+ years -Dog care, Veterinary shelter medicine and infectious disease, Behavior assessment, Rescue
Reply to Tammy Falkner
Sent April 30, 2005 10:11 a.m. (11 minutes and 39 seconds later)
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She is panting and trembling as if she is in pain and she is holding up her right front leg as if it is in pain. She is a Boykin Spaniel and just eight monts old. She is in what we believe is her first heat. She has swelling of the vulva and has been discharging for over a week. She just sits or stands and is not very active.
Thank you, Customer (name blocked for privacy)
Customer (name blocked for privacy)
Answer
April 30, 2005 10:14 a.m. (2 minutes and 53 seconds later) ACCEPTED
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This is not normal behavior in my opinion. You usually don't see it as much in young dogs but there is a disease of the uterus called Pyometra. Pyometra means that the uterus is infected. This can be life threatening. Her desire to only stand also might be an indicator of this.
Dogs experience cramps just like people but I think that you are seeing more than that.
You should see the vet today to find out what's going on.
i do know that pain and panting can be a sign of pyrometra too.... i would just call your vet....not go there, but just call them and see what they say