وحكم القياس الثاني: فساده بممانعة التجنيس، والفرق الخاص
An analogy by genus may be challenged by denying the claimed common genus or identifying a specific legally operative distinction.
Denial of genus: the supposed shared legal category is unproven.
Specific difference: a relevant feature changes the rule for one case.
For example, two animals may occur in homes, yet one may have a separate governing proof. Shared residence is then insufficient without deeper causal analysis.