Chewy generates $12.60 billion in annual net sales through a vertically integrated e-commerce platform that combines direct product sales, subscription Autoship services, pharmacy fulfillment, sponsored advertising, and an emerging veterinary services business. The revenue engine breaks down into four primary streams. Product sales — pet food, treats, litter, toys, hard goods, and accessories — represent the core business, generating the majority of revenue through Chewy's website and mobile app. In FY2025, the company offered approximately 130,000 products from roughly 3,200 brands, including national brands like Hill's Science Diet, Royal Canin, and Blue Buffalo, as well as private-label brands including American Journey, Tylee's, Frisco, and Dr. Lyon's. Private-label penetration, while not disclosed precisely, is estimated at 15-20% of consumables revenue and carries gross margins 500-1,000 basis points higher than third-party brands. Autoship is the dominant monetization mechanism and the single most important driver of Chewy's unit economics. In FY2025, Autoship customer sales totaled $10.50 billion, representing 83.3% of total net sales — up from approximately 78% in FY2024. Autoship customers set recurring delivery schedules for consumable products (food, treats, litter, medications), receiving a 5-10% discount on each order in exchange for the subscription commitment. The strategic value of Autoship extends far beyond the discount: Autoship customers spend approximately 1.5-2.0x more than non-Autoship customers over their lifetime, exhibit 40% retention rates versus less than 20% for brick-and-mortar competitors, and generate predictable demand that reduces inventory risk and enables bulk purchasing discounts from suppliers. In Q4 FY2025, Autoship sales reached $2.7 billion, representing 84% of quarterly net sales. The Autoship program has effectively converted Chewy from a transactional e-commerce site into a subscription commerce platform with SaaS-like revenue predictability. Chewy Pharmacy and Chewy Health represent the highest-margin and fastest-growing revenue streams. The pharmacy business, launched in 2018, fulfills prescription and over-the-counter medications for pets, including compounded medications, specialty diets, and preventive care products. Pharmacy revenue carries gross margins of 35-45% — significantly higher than the 25-30% margins on standard pet food and supplies — because prescription products face less price competition and benefit from regulatory barriers to entry. The Connect with a Vet telehealth service, launched in 2020, provides 24/7 virtual veterinary consultations for a fee, creating a recurring services revenue stream and driving prescription capture. In FY2025, Chewy Vet Care (CVC) — the company's physical clinic network — opened 10 new practices, bringing the total to 18 locations across five states. CEO Sumit Singh described CVC as the fastest NSPAC compounder in the business, with Vet Care customers generating approximately $900 in Net Sales Per Active Customer in year one — 2-5x that of a typical Chewy customer. In April 2026, Chewy announced the acquisition of Modern Animal, a technology-forward veterinary platform with 29 owned clinics, which will expand the CVC footprint to 47 locations and add over $125 million in annualized run-rate revenue. Sponsored advertising and marketplace fees represent an emerging revenue stream. Chewy sells sponsored product placements, display advertising, and promotional slots to pet brands seeking visibility on the platform. While advertising revenue is not broken out separately in SEC filings, industry analysts estimate it contributes $100-200 million annually at margins exceeding 70%. The Chewy+ membership program, launched in 2024, offers free shipping, exclusive discounts, and priority customer service for an annual fee — similar to Amazon Prime but pet-specific. By the end of FY2025, Chewy+ penetration reached approximately 4% of the active customer base, representing an early-stage but strategically important recurring revenue layer. Geographically, Chewy operates exclusively in the United States, with no international revenue. The company ships nationwide from a network of automated fulfillment centers and pharmacy facilities. The U.S. pet industry was valued at approximately $136 billion in 2023, with e-commerce representing 32-35% of total sales and projected to reach 40-45% by 2026. Chewy holds an estimated 41% share of online pet sales, second to Amazon's estimated 45-59% share, and well ahead of Walmart (33% of online pet sales), PetSmart, and Petco. Gross margin expanded to 29.8% in FY2025, up 60 basis points from 29.2% in FY2024, driven by private-label mix expansion, improved supplier terms, and operational efficiencies in fulfillment. Cost of goods sold was $8.84 billion in FY2025 (70.2% of net sales), leaving gross profit of $3.75 billion. Selling, general, and administrative expenses totaled approximately $2.4 billion (19.0% of net sales), while advertising and marketing spend was $825 million (6.5% of net sales) — a disciplined ratio that reflects Chewy's reliance on organic retention and Autoship renewals rather than aggressive customer acquisition. Adjusted EBITDA of $719.2 million at a 5.7% margin represents a 90 basis point expansion from FY2024, demonstrating operating leverage as the customer base matures. If Chewy's #1 revenue stream — Autoship subscription sales — disappeared, the company would lose $10.50 billion in annual revenue (83.3% of total), its most predictable cash flow, and the entire foundation of its customer retention strategy. Autoship is not merely a revenue stream; it is the operating system of the business. Without Autoship, Chewy would revert to a transactional e-commerce site with customer acquisition costs comparable to Wayfair or Overstock, gross margins compressed by competitive pricing, and inventory planning reduced to guesswork. The 40% retention rate that Autoship enables would collapse to industry norms below 20%, and the $591 Net Sales Per Active Customer would likely decline as customers cherry-pick promotional offers across multiple retailers. The loss of Autoship would also eliminate the data foundation for Chewy's personalization algorithms, predictive replenishment, and cross-sell recommendations — capabilities that competitors like Amazon and Walmart are still building in the pet category.