I treat dogs like children (old fashioned way), stern voice control, flick of a finger on the rump, show dissatisfaction, normally that is enough.

Never had need for dog trainers had medium and large dogs in the house for over 30 years. Took in a Great Dane at one year of age, he was an absolute hoot when he stopped my husband entering the home in the first few days, actually ended up being a big softy!