You can't do anything about it.

When you vacuum, start at the far corner and vacuum your way out keeping your lines as parallel as possible.

You could lay down runners on your walkways.

You will get used to the look, and actually as you and your pet move around on it the shading will become more subtle and homogeneous. Don't let it make you develop OCD!

Realistically, this is the nature if carpet and I don't think anyone would realize that you wouldn't know that, because most people will have experienced carpet at some point before they are purchasing it for their home. So don't worry, it's not poor salesmanship or anything like that.

Buy a carpet rake.

I am intrigued by “pet stain resistant” carpet does it have a funny smell that keeps pets off or an electric charge , sorry but this to me is a great gimmick to get you spend more money the first time a pet pees on that carpet your fate is sealed they will go back there over and over

The rug is made out of fibers that are not easily stained. Your pet can still misbehave but the result is easier to remove. I had proof today when my cat knocked over a buttered English muffin right onto my new carpet & I blotted up the butter with warm water & a little Woolite. It didn't leave a mark! BTW: I decided to handle the footprints on my plush rug by making a creative mess (i.e., sort of like finger painting with my feet) until all the different shades blended together in an interesting way. No more footprints!!! In terms of peeing, I have no idea about the smell but luckily my dog wears a 'belly band' so he can't pee on the carpet.

That's the spirit!!! If you can't beat'em; join'em! I like the "carpet finger painting" idea. That's a great way to camouflage foot prints!!! Way to go! I like your attitude!