I have a 2yr old pembroke corgi bitch who has been to the dog twice but to no avail. The only thing is she comes into season every 4 months not 6 does this have anything to do with not getting her in pup? Help i'm desperate as she is in season again now after another 4 months. she is as regular as clockwork but 4
monthly not 6.

Paula & "Pippa"

'The Book of the Bitch' (a dog-breeder's 'bible') says that seasons at intervals of less than four months are often associated with infertility. Have you had her ovulation-tested?

I'd try a different dog if I were you next time.  I think that it's a bit late to get anything organised this season though.