Change the bag, or if bagless, give the bucket a good wash with warm water and a gentle detergent and leave to dry.Change any filters, or wash them with warm water and gentle detergent and leave to dry (can take a day or two)Give all hard surfaces a wipe with a damp cloth that has some gentle detergent on it. Leave to dry.Next, find some clean flooring that does not have dog hair or dander on it, and pour bicarbonate of soda on it. Vacuum this up. Empty this back out onto the floor and repeat a few times.Once you are happier with the smell that is emerging, discard that batch of bicarbonate of soda, and put a fresh batch in a bowl. Mix in a couple of drops of essential oil (lemon or eucalyptus or lavender are all good), and vacuum that up a few times as before. You can also add some spices as suggested below.If your vacuum is still noxious, get some activated charcoal from the pharmacist and go through the procedure again.