My dog has a stinky ear infection with worms. What should I do?

Vito’s ear looks significantly infected and is likely very painful. You are not going to be able to treat this at home. First you need to know what type of infection is present so that appropriate medications can be selected. He also likely needs pain relief, steroids or other anti-inflammatory and a topical cleanser as well. This is all dependent upon the condition of the ear canal, the type of infection present and any pre-existing medical conditions he may have.
Pets can have many types of worms and you need to know what type of worm he has in order to select the appropriate medication. If you do not select the appropriate medication, the worms will not be killed. It is also important to remember that some types of worms are transmittable to humans so you want to get this taken care of quickly. I recommend to have Vito examined by his veterinarian today for treatment and so that he starts feeling better faster. I hope this helps and that he feels better quickly.