Questions & Answers about El perro es tranquilo y obediente.
Since the lesson is about conjunctions changing, why didn't y change to e before a vowel in y obediente?
The word y (and) only changes to e when the next word starts with an ee sound (spelled with i- or hi-). Because obediente starts with an o sound, the conjunction stays as y.
Why use es instead of está here?
Should obediente end in -o since el perro is a masculine noun?
No, Spanish adjectives that end in -e (like obediente and inteligente) are gender-neutral. They stay exactly the same whether they describe masculine or feminine nouns.