Reply #10: Neutering may take care of it.

[China_cat]

But you may end up having to realize that the older dog is no longer on top. I watched it happen with my females (and there's nothing like 2 bitches for a fight). Both spayed at a young age but as Rosie got older, Dot took over. And the worst fights happened when I tried to treat them as if the order had not changed.

Watch who goes out the door first, who heads for the food first, who takes the best sleeping spots. You'll probably see a change at least a good part of the time. I can't even tell you about the fights I had to break up simply from putting down the wrong dog's food bowl first. (On good days they'd just refuse to eat until I picked them up and put them back down in the 'right' order)