It has been my experience that it’s priceless to have an older dog to help guide a younger dog in the ways of being a proper dog.
Petunia has a ton of energy, but Isis really helps keep that in check.
petunia is at the age where she is now strong and fast enough to best Isis in an actual fight, but Isis is the absolute boss with her voice and her toothy grin.
Canute weighs 120 lb. and, at 8 years old, has all the youth and strength he needs to dominate Ulysses, who’s 13 and 90 lb. Doesn’t make any difference; Ulysses is still the boss without any intimidation. By canine standards, he was the perfect alpha dog. Looks like you are well on the way to the same kind of a great canine family. More power to you and yours.