Get a sample if you can and have at it!

I'm sure our resident tile expert Bill V will chime in on this one

By nature of porcelain tile you are in a good place - as far as being impervious

A quote from the tile guru John Bridge
"To be classed as "porcelain," a tile cannot absorb more than .5 percent of it's total mass in water. Many porcelain tiles absorb less than that -- down to as little as .1 percent. In the industry, these tiles are called "impervious."

Here is a link that might be useful: John Bridge

I sampled so many pieces of Porcelain tile when I was deciding on which one to go with and I was amazed at how most of the tiles of all brands seem to hold up well to ketchup, marker, ink, dirt, etc. It is the grout I am finding out that stains and not the Porcelain Tile. Even Epoxy grout does not like Pee stains. But I found a product called Gonzo Pet stain remover that is finally cleaning the pee out of the grout since I keep a puppy pad in a tray in one of my foyer areas for my little dogs to use if I can't take them outside and sometimes one of them misses the pad and it was staining the grout despite using Lowe's Laticrete Spectraloc Mushroom grout. The front foyer where there is no pee stains nice and clean.

I have some tile samples now, so I suppose I'll have to share my glass of wine tonight. :)

Thanks everyone for your help.

Spill away. Nothing to worry about with porcelain. :-) You have to try.... and I mean REALLY try to stain it.