Weird Hardwood Floor Issues - Poly

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We had our den floor tore up a couple years ago and new hard wood floor put in. It was by Bruce and the name of the wood was Tiger Wood. Really nice floor, solid wood, not cheap. Just as it was finished, I noticed what appeared to be a scratch. I ignored it and as the months went on, the floor was a magnet for scratches. It was like putting pine down on the floor. It "dented" easily. I don't know how to describe it.

Anyways, after a while we decided to clean the floor real good and seal it up with some polyurethane. I went for the gloss finish as it looks really nice. Well, I applied the stuff over the course of 2 days. I did 2 coats. Even coats. I let it dry a day between coats. Then after all was said and done, I let it dry a week with no traffic the first 3 days. After that I put down thick brown paper for light foot traffic. After 7 days, it was full fledged moved into. Furniture put back on and carpets put down.

However - here is the really weird and odd issue. The poly lasted less than a month. Areas where there is traffic appears to be NOTHING there. It's dull and dingy. Back to the wood again. Some areas look like there is poly but hazy. Then finally where furniture is - when you move it - the floor looks brand spanking new with shiny poly. Like it should.

I want to do this again, however - I don't want to waste my time and it happen again. What happened? Anyone have any ideas why the poly lasted less than a month? I am really not understanding it. We do have 4 dogs and the nails can be rough but other parts of the house with hardwood and nice shiny poly still look nice and new and they were done the same time. I am at a loss at what the problem is here.

If anyone out there has any ideas I would love to hear it. I am thinking of contacting Minwax and Bruce flooring to see if they can offer any insight Monday.