(ג) ...חמץ שנפלה עליו מפלת, הרי הוא כמבער. רבן גמליאל אומר: כל שאין הכלב יכול לחפש אחריו.
(3) ...If chamets has been covered by fallen ruins, behold it is as if it is destroyed; Rabban Shimon ben Gamliel says, "Only when [it is so covered that] a dog cannot search for it."
We see pesachim talks about a dog once.
It talks about if
ובכזית אין חילוק אלא אם כן מטונף הרבה, שאינו ראוי לאכילת כלב.
...But in a kuzayis, it doesn't change if it is very dirty, that a dog wouldn't eat it.
Second time pesachim talks about a dog as the defining factor.
(לו)...בְּחֵ֣לֶק יִזְרְעֶ֔אל יֹאכְל֥וּ הַכְּלָבִ֖ים אֶת־בְּשַׂ֥ר אִיזָֽבֶל׃
(36) ... In the portion of Jezreel shall the dogs eat the flesh of Jezebel;
What does this have in common with above?
We can see that not only will dogs eat almost anything, but;
We can also see that there is such a