US probiotic dietary supplement sales

Between 2005 and 2022, dog treat market revenue and probiotic supplement sales both grew in the US, correlating at 0.9636 across eighteen data points. The unified consumer is a person who believes deeply in gut health—both their own and their dog's—and is willing to pay a premium for both. There are, in fact, probiotic dog treats on the market, which means this correlation has predicted its own product category with the same reliability as the pet food and pumpkin spice correlation earlier. The American wellness consumer is nothing if not consistent: whatever they take, the dog takes too.

Dog treat revenue grew from roughly $3 billion to over $9 billion, driven by pet humanization and premium ingredients. Probiotic supplement sales grew from a niche category to over $5 billion, driven by gut health awareness, microbiome research publicity, and mainstream retail adoption. Both are wellness-adjacent consumer categories that grew during the same 18-year window among health-conscious consumers willing to pay premiums for perceived benefits.

Two wellness-adjacent consumer categories growing during the same 18-year period will produce a strong correlation. The probiotic and the dog treat describe the same consumer's spending philosophy: if it's good for you, it's good for the dog.