Depends what the difficulty was. Dekka was spayed during her C section a week and a bit ago. Not just due to needing a C section but due the panic and stress see seemed to experience. If the bitch say, had c section but otherwise was fine.. I would breed again, say had a bit of retained placenta...I would breed again. There are many 'minor' issues that a bitch could have that would make me not want to breed her with out a rest, but that would not stop me from breeding her again.