Frequent barking at every sound or sight can indicate lack of training. Obedience helps curb nuisance barking
Aggressive lunging or snarling at passings dogs is alarming. Training can help improve socialization skills.
Dogs who constantly pull during walks are difficult to control. Loose leash training teaches them not to strain against the leash.
Dogs who destroy furniture, shoes, etc when left alone likely need more stimulation. Obedience provides an outlet.
Dogs often jump out of excitement. Training removes rewards for jumping and replaces with preferred behaviors.
Disobedient dogs who ignore basic commands need reinforcement. Refresher obedience sessions can help.
Excessive reactivity or anxiety may benefit from professional intervention like training.