So many of us have rescued adult dogs and have other dogs at home. I am sure there will be lots of advice available to deal with specific problems. We rescued Clancy from a shelter as a 2 year. We had an older lab mix, an adult Springer Spaniel (age 6 then) and another 2 year old doodle. The lab mix told Clancy he was boss right away, followed by Ned our small doodle, then Clancy and our Springer 'duked it out for a couple of months for bottom of the heap.