In the modern digital ecosystem, the hyperlink has long been considered the fundamental currency of the internet—a neutral bridge connecting disparate corners of the web. For decades, businesses operated under the assumption that linking to third-party content, such as scientific studies, news reports, or influencer endorsements, was a passive act that distanced the linking entity from the destination content’s claims.

That legal comfort zone has been effectively dismantled. A pivotal decision by the U.S. Court of Appeals for the Tenth Circuit in KetoNatural Pet Foods, Inc. v. Hill’s Pet Nutrition, Inc. (No. 24-3185, July 14, 2026) has introduced a transformative standard for digital marketing. The court ruled that when a company intentionally embeds hyperlinks to third-party materials to bolster its own promotional messaging, those linked materials may be legally classified as the company’s own "commercial speech."

This ruling carries profound implications for the Lanham Act and consumer protection law, signaling that digital marketers can no longer treat hyperlinks as "disclaimer-protected" islands. Instead, the entire digital pathway—from a company’s homepage to the furthest reach of an external link—is now subject to intense scrutiny under false advertising statutes.

The Chronology of KetoNatural v. Hill’s

The case emerged from a competitive landscape in the pet nutrition industry, where claims regarding health benefits and nutritional science are frequently contested.

• The Initial Dispute: KetoNatural Pet Foods initiated litigation against Hill’s Pet Nutrition, alleging that the latter engaged in false advertising under the Lanham Act. The core of the dispute centered on how Hill’s utilized digital resources to support its marketing claims.
• The Mechanism of Contention: Hill’s had embedded hyperlinks within its own marketing materials that directed consumers to third-party content. These links were not mere footnotes; the plaintiff argued they were strategic components of a broader promotional narrative designed to validate specific health claims about their products.
• The District Court Threshold: The case worked its way through the lower courts, where the primary question became whether a corporation can be held liable for the content found on a website it does not own or control, simply because it provided a navigational path to that content.
• The Tenth Circuit Ruling (July 2026): In a decision that has sent ripples through the advertising law community, the Tenth Circuit affirmed that third-party materials reached through hyperlinks can indeed constitute commercial speech. The court held that when a business directs consumers to external content as part of a deliberate promotional strategy, it effectively "incorporates" that destination content into its own marketing message.

The Legal Standard: "Intentional Incorporation"

The crux of the Tenth Circuit’s decision lies in the concept of "intentional incorporation." The court moved away from the binary view that a link is either "yours" or "theirs." Instead, it focused on the intent and functionality of the hyperlink.

When a marketer selects specific third-party content to reinforce a product claim, they are creating a unified marketing ecosystem. If a consumer is guided from a product landing page to an external blog post, a white paper, or a peer-reviewed study, the court found that the "pathway" is as significant as the destination.

Why This Matters: The Erosion of the Passive Link

For years, defense attorneys have argued that linking to a study or a third-party review was an act of transparency—a way to show the consumer the "sources" behind a claim. The Tenth Circuit has now essentially ruled that if that source is used to make a commercial claim, the advertiser is responsible for the veracity of the destination content. If the linked content is deceptive, scientifically inaccurate, or misleading, the linking company may be held liable under the Lanham Act for false advertising.

Implications for Digital Marketing and Compliance

The ripple effects of this ruling are immediate and wide-ranging. Digital marketers, who have become accustomed to embedding links to everything from affiliate testimonials to external medical journals, must now conduct a comprehensive "due diligence" audit of their web infrastructure.

1. The FTC and State Enforcement

Regulatory bodies, including the Federal Trade Commission (FTC) and various state Attorneys General, are likely to view this ruling as a green light for expanded oversight. The FTC has long maintained that marketers are responsible for the substantiation of their claims. This decision provides a legal framework for regulators to argue that a company’s "substantiation" is not merely the internal data they possess, but the entirety of the external content they promote through hyperlinks.

2. The Influence of Generative AI

The court’s decision is particularly timely given the rise of AI-driven marketing. Many modern AI tools automatically generate content that includes citations or links to external sources to appear authoritative. If an AI agent creates a promotional blog post for a brand and includes a hyperlink to an inaccurate third-party report, the KetoNatural decision suggests the brand is on the hook for that inaccuracy, regardless of whether a human employee manually placed the link.

3. The Scope of "Promotional Programs"

The ruling clarifies that the definition of a "promotional campaign" is no longer restricted to what is written on the brand’s domain. It is a holistic, interconnected map of information. Whether it is an influencer program that links to external reviews or a scientific marketing campaign that links to external studies, the entire pathway must be vetted for compliance.

Expert Perspective: Adapting to the New Reality

Richard B. Newman, an advertising practices attorney at Hinch Newman LLP, notes that this decision represents a sea change in how legal teams must approach web compliance. "We are moving into an era where the digital footprint of a company is not just the content it creates, but the content it curates," Newman observes.

"The takeaway for the industry is clear: courts are looking at the digital user experience as a whole. They are looking at the ‘pathway.’ If you are driving traffic to a third party, you are effectively endorsing the contents of that destination as a part of your own sales pitch. Advertisers need to move away from the ‘hands-off’ approach to hyperlinking and adopt a rigorous verification process for every outbound link on their platforms."

How to Mitigate Risk: A Compliance Checklist

In light of the KetoNatural ruling, marketing departments and legal teams should consider the following steps to mitigate the risk of litigation:

• Audit Hyperlinks: Conduct an inventory of all outbound links on your corporate website, email marketing, and social media advertising. Identify which links are used to support product claims or testimonials.
• Vetting Protocol: Treat every destination URL as if it were your own landing page. Ensure the content at the destination is scientifically sound, accurate, and free of misleading claims.
• Disclaimers are Not Enough: While disclaimers remain a best practice, the KetoNatural ruling suggests they may not provide a safe harbor if the court views the hyperlink as an integral part of the promotional message. Do not rely solely on "we are not responsible for third-party content" language.
• Review Influencer Contracts: Ensure that contracts with influencers or affiliates include indemnity clauses regarding the content they link to, and ensure that your brand maintains editorial oversight of the promotional paths your partners are creating.
• Monitor AI-Generated Content: If your organization uses generative AI for content creation, implement a "human-in-the-loop" review process that specifically audits any links or citations generated by the software.

Conclusion: The New Duty of Digital Stewardship

The Tenth Circuit’s decision in KetoNatural Pet Foods, Inc. v. Hill’s Pet Nutrition, Inc. marks the end of the "wild west" era of hyperlinking. By establishing that hyperlinked content can function as commercial speech, the court has placed a new, significant burden of stewardship on businesses.

In the eyes of the law, the internet is no longer a collection of isolated pages, but a cohesive web of information. When a brand invites a consumer to follow a link, they are extending their brand promise to the destination of that link. Moving forward, companies that treat their hyperlinks with the same level of legal scrutiny as their primary ad copy will be the ones that survive this shift in the regulatory landscape. For everyone else, the potential for false advertising claims has just expanded by the number of links on their website.

Disclaimer: This article is for informational purposes only and does not constitute legal advice. The legal landscape regarding digital advertising is complex and subject to change; businesses should consult with qualified legal counsel regarding their specific marketing practices.