The answer to 'grout pet stains' is that pet urine and feces can cause discoloration, odor, and even damage to grout. Common causes include pets urinating on the floor, accidents, or tracked-in dirt and debris. Symptoms include yellow, brown, or black staining, as well as a lingering odor. Solutions depend on the severity of the stain, but can include cleaning with a specialized grout cleaner, applying a sealant, or in severe cases, re-grouting the affected areas.
For minor stains, homeowners can often remove them with a DIY grout cleaning solution. However, for deeper set-in stains or odors, it's best to call a professional cleaning service. They have the right tools and expertise to properly clean and restore the grout without causing further damage.