I had my floors professionally done six years ago. They looked great
for 4 years. Then I got two dogs...

Now, they still look barely good, they polyurethane is almost gone. I
know how to fill in some slight cracks with wood filler.

I'd like to do the refinish on my own, since I'm going to have a good
amount of wear and tear thanks to the dogs.

Could I just remove the polyurethane with a stripping gel and re-apply
the polyurethane? I'd like to avoid sanding. Thought I'd check here
before I tried it on small area...