Some of this is not a training problem, and treating it like one wastes time your dog may not have. If they are distressed when you leave, if they growl or guard their food, their toys or you, if they are frightened on the lead, or if anything about them changes suddenly at any age, contact your vet the same day. A tip from a website, ours included, is not the answer. If it cannot wait, contact your nearest emergency vet now.
With a Basset Hound, watch their back and their eyes. If a Basset suddenly will not climb the step they always take, cries when you pick them up, walks hunched or wobbles on their back legs, contact your vet now. Bloat (GDV, a twisted stomach) needs the same speed: a swollen, tight belly, retching with nothing coming up, sudden restlessness or drooling. It is most common in large, deep-chested dogs, so skip walks and hard play shortly before and after meals. In an older Basset, bumping into things at dusk can be cloudy eyes. Their calm nature makes all of this easy to mistake for character, and that can cost them time.
Their ears will keep reaching dinner first. Keep wiping them, and if they start to smell, tell your vet.