I'm an Ox who was married 40 years to a Dog... he's interested in a Rooster (10 yrs. younger)... ?

Hi Marj, the problem may be that your partner is tired of being bothered by the daily trifles and your stubborness. So I suggest you try to bear his desire to pursue the freedom and be more considerate and torlerent with him. If so, he may fin your change and come back to you.
As for the relationship between a male dog and a female rooster, at the very beginning, they may live happily. However, the rooster treats the dog to tough and spare little personal space for the dog, and they will have many arguments then. So you can also try to make your partner have his own space.