Well, IKEA is a dirty shop! People touch everything and I can assure the average animal is cleaner than the average human. Not mention the gym and supermarket.
How do you know the restaurants you eat are clean? There kitchens are? How you do know the bread you bought hasn't been dropped on the floor or been touched by six different people.
We live with nature, are part of it and if you truly believe your environment, the places you go have no traces of animals you are wrong. But I understand what you mean, although a different pH has nothing to do with it. Hair on your food, or drooling smelling animals, just like smelling people, do influence the eating experience.