Hello and welcome.
I've never owned a female, but from Google - first result -tell me please what is fertile period from the start of the bleeding in golden retriever it course if you could.
Your wife either misunderstood or misinformed you.My wife informed me from "internet knowledge" It's two weeks.
Do you mean your wife? I'm afraid using sentient animals purely for profit is not thought of as ethical.try to imagine woman in her thirties which soon will be struggling to choose to pay mortgage bill or maybe pay for new born food