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6 months old usually, but for a larger size dog it may take as long as two years
Yes.
until the female has giving birth
Yes as long as the larger dog is the female
It is a dog that has been desexed, through Castration. Either castration for a male dog or spaying for a female dog. The dog is then mixed gender, neither male nor female.
As long as it is not a female dog it is. Male dogs are called "Dogs". Female dogs are called "Bitches". See the related questions "What is a dog when it's not a dog?" and "Is my dog a dog?" for more information on these interesting questions.
Yes as long as the male dog is not fixed
6 months
Proestrus can last for a period of seven to thirteen days in dogs, depending on factors of health, breed, and size.
Hmm in my point of view (as i have a dog too) the dog behavior will change and be more active interaction towards the opposite sex dog. so just keep them awy or you might end up having new puppy in your home.
That depends on her health.
It's a name for a female dog who is going through heat.