We have two 18 month old dogs, one Ridgeback cross female, and one smaller mixed breed male. They do everything together. Originally the male was getting into our one neighbour's property at night (we plugged all accesses in the fence, and eventually think he resorted to clambering over the top!) In desperation we have been confining him to his kennel overnight, for about 2 weeks at a time. At the end of this time we let him out over night, and he behaves for perhaps the first 2 nights, then goes out again.
Recently both dogs have developed an interest in the dog belonging to our neighbour on the other side, and they have been clambering over the wood slat fence. We nailed slats inbetween those already there to remove the "toe holds", but they still got over somehow. We are now confining them both to their respesctive kennels overnight, but don't want this to be a long-term thing.
Please would you advise me as to how we should be dealing with this.