Global Pet Boarding Market Size, Share & Demand Report By Pet Type (Dogs, Cats, Small Mammals, Birds, Exotic Pets), By Service Type (Overnight Boarding, Luxury Boarding, Daycare Boarding, In-Home Boarding, Medical Boarding), By Facility Type (Kennels, Pet Hotels & Resorts, Veterinary Clinics, Home-Based Providers, Boarding Chains), By Pricing Tier (Economy, Mid-Range, Premium), By Booking Mode (Offline, Online), By Region & Segment Forecasts, 2026–2031