"Do you dress up the cats?"
Translation:Tu vesti i gatti?
it depends on the form of the nouns and if they are possessive.
"Tuoi" is used for example : "I tuoi gatti sono rossi". The cats are your and cats is plural so you need "tuoi". If it were only one cat: "Il tuo gatto e rosso"; one cat, your cat.
In this example there are no possessives. It just a simple question. Do you dress up Tu vesti; the cats i gatti.