Dias v. City & County of Denver (paragraph break added):
[T]he plaintiffs have alleged a substantive due process violation sufficient to survive a motion to dismiss for failure to state a claim. Viewing the factual allegations in the light most favorable to the plaintiffs, as we must, the complaint plausibly alleges that the [pit bull ban] Ordinance is not rationally related to a legitimate government interest. Although the plaintiffs may be unable to demonstrate through evidence that the Ordinance is irrational, the complaint makes out a claim for relief.
It is uncontested that Denver has a legitimate interest in animal control — the protection of health and safety of the public. Even so, the plaintiffs have alleged that the means by which Denver has chosen to pursue that interest are irrational. In particular, the plaintiffs contend that there is a lack of evidence that pit bulls as a breed pose a threat to public safety or constitute a public nuisance, and thus, that it is irrational for Denver to enact a breed-specific prohibition.
Pointing to the cases where courts across the country have rejected substantive due process challenges to pit bull bans, Denver argues that the Ordinance is rational as a matter of law. This argument misconceives the nature of the plaintiffs