A dog show is not a random sampling of the breed: it is typically limited to dogs that are adult, pure-bred, and exemplary.
ɐ dˈɑːɡ ʃˈoʊ ɪz nˌɑːɾɚ ɹˈændəm sˈæmplɪŋ ʌvðə bɹˈiːd: ɪɾ ɪz tˈɪpɪkli lˈɪmɪɾᵻd tə dˈɑːɡz ðæt ɑːɹ ɐdˈʌlt, pjˈʊɹbɹˈɛd, ænd ɛɡzˈɛmplɚɹi.