Take trash out if needed. Get pets out of the way. Not everyone loves animals and your buyer may be allergic. Bathrooms should be clean, towels folded, toilet seat down. Make every effort to NOT be in the house during the showing.
Buyers feel very uncomfortable when the owners are present.
They typically will not voice any objections and will hurry through the home. Agents can be much more effective when they can handle objections on the spot or feel free to let the buyers spend time in the home. Take the dog with you. Pets can be a nuisance when strangers come to see your home. If you can't isolate your pet, take it with you.