Email and SMS replenishment flows remind your customers before their pet runs out — food, supplements, flea treatment, treats. On Amazon, the customer goes back to Amazon and might buy from a competitor. On your DTC store, the second purchase comes back to you. This is where the real margin lives, and it’s the entire reason DTC is worth building. Subscription-anchored refills routinely 2-3x customer LTV compared to one-shot purchases.