Question for those with more than one dog, fighting?

[Sevaede]

I guess my parentals and I are one of the lucky few.

We had three females Treasure (GSD), Trixie (one of her pups, GSD/Rottie mix), and Little Dog (Yorkie) and none of them have ever had a fight. Treasure was definitely alpha. Treasure has since passed away and Willy (Doxie/Bassett Hound) has come to live with the parentals. He is so passive and doesn't really care who's dominant. Trixie likes to initiate play by throwing her paw on Willys back and he really hates that. Willy does growl like he wants to do something about it but 1) he never does and 2) she thinks he is playing so she just does it until she is told to stop. Trixie will also do that to Little Dog and L.D. will just bite her and hold on. Trixie will parade around like that until she jumps down and runs off.

I think Trixie has taken alpha position. She takes everything in stride, though, so nothing goes on, really.

[Daisy and Delilah]

Daisy and Delilah have a few "Mexican Standoffs" now and again when food or space is involved. They growl under the cover at bedtime at each other if one of them is in the way of the other. Sometimes, I see them giving each other a toothy grin and I just firmly tell them to stop. If I don't remain calm, they get worse. They're also still trying to figure out which one of them is top dog