We have 3 dogs, Duke and Violet, my almost 2 y/o beagles and Cassie, my 13 y/o yellow lab. We also have a cat, Phoebe and a bird, Allie (though this is my son's bird and she stays in his room 100% of the time). Before we got our rescue, Violet, we had another 13 y/o lab, Roscoe. He went to the bridge in May. But we've had 3 dogs at once for almost 2 years now.
Feeding: Not an issue. Cassie will be bowl dominant with Violet (they switch around bowls) and Duke often isn't as interested in dog food as the girls, so we do feed him up on the spa cover, since he's the only one that can jump up there. That way, the girls aren't eating all of his food. Now if treats are involved, I have to be careful how they are given so Cassie doesn't get dominant with Vi.
Sleeping: The beagles and usually the cat all sleep in our bed (good thing it's a king!). Cassie prefers to sleep in my son's room. I am convinced this is because he stays up late and often gets late night snacks, so she stays up with him! She does want in our room early in the morning, so we bring her in then.
Jealousy: They are all jealous to a certain extent. If I'm petting one, the others have to come over and get their love. And every time I'm on the floor with Cassie, Duke will come and start licking her mouth (and I mean, inside her mouth!EW). But I make sure that each of them gets alone attention, as well as group attention. And if I see one on the couch and give that dog love, I make sure to go to the others and give them love, and the cat, too. They are demanding! LOL
You would think Cassie is the leader of the pack because of her size and age, but in many ways, Duke is. They tend to follow his lead. But they all get along well, other than the incidents with Cassie and Violet when we first got Vi, but Cassie was a spoiled mommy's girl and had to learn to share with another girl!