Pet urine can fill a house with the smell of ammonia and other strong scents. Although you may get used to the scent, the longer you go without treating the stain and smell, the harder it will be to remove from your walls, carpet, clothes and furniture. You can get rid of dog urine smells whether they are new or old. Its important to follow the proper steps. The biggest question I get is How to remove pet urine from carpets. Pet odors are often caused by animal urine and fecal matter. People often underestimate pet odors by forgetting that they are cumulative. For this type of odor, the best process for removal is biological. Biological processes are based on genetically engineered bacteria that are activated with water prior to use. When applied to the carpet, the bacteria will produce enzymes which then digest the odors and staining, “eating” them away.