There is no upper limit for female dog to breed but there is minimum age blow which breeding is not recommended in all dogs. Dogs should be used for breeding when physically fit and this fitness is achieved after 2 years of age.
For upper limit of dog for breeding purpose, it is recommended that dogs should not be used when they become old. So, after the age of 6-7 years, dogs should not be used for breeding.
For upper limit of dog for breeding purpose, it is recommended that dogs should not be used when they become old. So, after the age of 6-7 years, dogs should not be used for breeding.