Cat urine damage not disclosed by seller

I just settled on a townhouse that the seller did not disclose extensive damage done by MANY cats in the house. The house was renovated by a 'flipper' and sold to my seller who disguised the smell with plug in air fresheners. When asked about smell or whether there had been any cats in the house they said there was none. Neighbors later said they knew about the extensive damage and had complained about the urine smell. The damage is VERY extensive and possibly may not be able to be eliminated. Where do I start? This is fraud but I was told by an attorney that I spoke with on the phone that he would ask for $10-$15k retainer and we would pursue a jury trial. I have to have a place to live and the place IS not habitable.

"Where do I start?"

Did you have an inspection of the property done before you bought it?  Surely a competent home inspector would not have been fooled by air freshener. 

If the carpeting, padding and flooring has to be replaced due to being ruined the first thing you need is an estimate from at least two vendors stating that and the cost to do it in writing.  Your word that it is uninhabitable due to cat urine won't be enough for the court. 

Have you contacted the seller about the issue?  If given the chance to cure the problem prior to going to court they may do so.  If not then you are going to have to sue them.  In which case you sue for the cost of the repairs to make the place habitable, your living expenses until you can move in, and attorney fees.  When faced with that potential bill the cost of fixing the floors may seem more appealing.  Call the seller.

Tear out the carpets and replace them.

It'll be cheaper than a lawsuit that you probably won't win.