That’s excellent advise from sdr. If I were you, I’d seriously consider not buying this house. Masking, or even getting rid of smells is one thing. Getting rid of allergens is something else altogether, and may not be easy to do.
You may be able to have the house thoroughly cleaned of all traces of allergens, and that would be great. But what if you can’t?
Remember also that if you are not ready and willing to walk away from a deal, then you may be overpaying (or worse, risking serious health problems down the road).
I realize that this is not what you wanted to hear… but we Piggs are extremely practical and objective, or at least we try 🙂