Global Pet Sitting Market Size, Share & Demand Report By Service Type (In-Home Pet Sitting, Boarding-Based Pet Sitting, Drop-In Visits, Pet Daycare, Specialized Care Services), By Pet Type (Dogs, Cats, Small Mammals, Birds, Exotic Pets), By Booking Channel (Digital Platforms, Independent Local Sitters, Veterinary-Affiliated Services), By End Use (Residential Households, Commercial Clients), By Region & Segment Forecasts, 2025–2030