I just got Abby spayed last week and now everytime she is outside she marks atleast every 2 mns.  There is no discoloration and she doesn't seem to have any pain.  Any ideas?  She goes potty and #2 normally when I bring her out but when we walk around all she wants to do is mark.  This has been going on for 3 days and in one hour today she marked over 35 times!  I'll be bringing her into the vet on Monday but I thought I'd check on here first if anyone has ever had this problem.  Thanks!

Thanks for the quick responses! : )  It might be a UTI, but it seems weird that she doesn't go all night while we are sleeping or while she is in the crate and I'm at work.  If she had a UTI wouldn't it be impossible to hold it for 8-9 hrs?  I'm really worried that this may be something more serious.   This is my first dog and I hope she isn't in any pain!  Btw, she is playing and acting normally except we haven't biked or ran since her spay last week.  I wish Monday was here so I could find out...

Well, I just got the results from Abby's urine analysis and everything was normal.   So now the vet is going to take another sample and culture it for a few days,  Abby is still squatting the entire time we are outside so hopefully the culture will find something!