hayan olfateado
-they/you have sniffed
Present perfect subjunctive ellos/ellas/ustedes conjugation of olfatear.

olfatear

Una vez que se hayan olfateado los unos a los otros... todos tratarán de maravilla a su pobre amigo.
Once they've all had a good sniff of each other... they'll all get along famously with your poor friend.
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