I don't blame owner letting go of the pets because of pregnant wife, it has nothing to do with the wife mostly or any health issues regarding pregnancy.
Its just that the owner are more worried about having to restrict the pets when the child is born and years later worrying about their infant kids mishandling kittens and cats. my 2 year old nephew killed two kittens thinking that those are dolls by twisting their heads.
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Maybe should add a question like " how are you going to teach your son/daughter to love pets and treat them well."
just my 2 cents.