Pet urine wether dog or cat is made up of a combination of high ph water, enzymes, urea, stomach acid, minerals and sometimes blood. In it's initial stage it is an acid on a ph scale but as it dries it turns to a yellow pigment. When a cat or dog pees, the liquid that comes out is an acid, but after 12 hours this acid begins transformation to an alkaline due to bacteria. PH levels are much higher in cats. Urine salts are produced from the alkaline mixes with the yellow pigment and causes the yellow discoloration that will discolor your carpets and rugs no matter what color they are they will turn yellow. This will be quite the eye soar and most homeowners will panic and throw what ever they have in the cleaning closet on the carpets. That usually becomes as costly mistake, as know of those products work. When it comes to urine pet stains your better off doing nothing than the wrong thing. 

The longer urine is left untouched the deep it may saturate in the pad our the subfloor. This will prove to be more difficult to remove. If you just grab any cleaner and it doesn't remove the stain , now you have a bigger problem. Now you have to remove the cleaner with an acid rinse and of corse your still lest with the pet stain. In this case your much better off calling a professional carpet cleaning company like TLC Carpet Care in Castle Rock. 

The greater problem is pet urine stains release ammonia gasses in the air you breath which can be a very unpleasant odor.This odor can be a two fold problem as not only is it coming from your carpet but it also could becoming from your padding. You may notice it more on humid days as the odor will get worse when humidity rises. Urine also soaks down into the carpet backing, the pad, and even the subfloor wether wood or concrete. Obviously concrete can be easier to clean as you will only need to bleach it out. 

If you have pet urine you need to get out of your carpets call TLC Carpet Care at 720-314-0178 and be sure to visit us at tlccarpetcare.net / carpet Cleaners Castle Rock