Using the Seaworthy, we can select different world settings when we create an RoG world to connect to SW. I tried to do an RoG world with no hounds and it appears that since then no hound appear at all in SW.
I didn't try yet if other settings like the length of days or seasons was also affecting SW but it might be possible.
Create SW world with default settings, find seaworthy in SW, create new RoG world, change settings to no hounds. Come back to SW.