Answer:
Cat,Vet,Today
Step-by-step explanation:
none of these are proper nouns, they are just regular nouns. If you were to get specific about something, such as the cat's name, then you would capitalize it. So ex: Could you pick my cat Gerald up from the vet? or if you wanted to specify the exact day you want Kira to pick up the cat, you would be like "He's having an operation on his paw today, Monday."
hope you get it!! :)
just remember you only capitalize proper nouns, you don't need to capitalize regular nouns