My 2 1/2 year old bitch who has always been almost 6 mths to the day with all her seasons and comes in around 1 1/2 weeks before her Mum was due in season in February.  She has still not came in and is showing no signs of starting.  Is it possible she has just completely skipped this season?  or is she just going to be extremely late!!  Never had any of my girls vary by more than a week or two.

Mine have gone nearly 2 months over and 1 month before they were due.

Normally regular seasons so I think it was all because I was planning to mate her!
First time the stud sat in UK waiting for missy to start her over due season, once he was booked to leave and do some shows in Europe, she starts her season.
Next time he was in europe and not due to come to UK till a week before she was due a season, season comes 1 month early!

lol@ Noora.  Sounds typical!!!  My girls have never been more than a week or two out, two months and still no sign seemed a bit weird to me. 

Im waiting for mine to come in, we thought she had a thyroid problem but we had her blood tested and this isnt it, vets say she is perfectly healthy but she has now gone 15 months since her last season ( 13 months since her litter) AHHHH they drive you mad!!!