Okay, here goes...
Many years ago I adopted a dog from the pound, she was the most incredibly good dog and has been with me for over ten years. She is now in her teens. Maybe 12-13? A large breed dog, part Keeshund and possibly part Shepherd. She is very well trained and knows over 60 different commands/phrases. Her name is Gypsy Rose.

We knew we'd get another dog when her time came, and debated on whether to get one now, or after. The logic was that now, she could help us train a new dog by example, and supposedly younger dogs breathe life into older ones. But we didn't make the decision, we looked around but never really decided. Until one day we encountered a dog unexpectedly and adopted her, another dog pound special.
The logic was flawed, and when Dakota's time comes waay down the road, we'll wait until the after. But that doesn't help us now. We're in it for the long haul.
Dakota was 8 months when we adopted her, and was a yo-yo dog. She'd been at the pound twice. It was obvious nobody had taken the time to train her, and she's come a long way in our care. We've had her for about 9 weeks.
We've taught her sit, lay down, stay, up (the stairs), go away, come, and a couple others, including some hand signals. We've taught her to eat from her own bowls, though she still tries to snatch a bite of Gypsy Rose's when her own bowl is empty. We've taught her to wait at the kitchen doorway while her food is being readied and not to go to her food bowls until given permission. She's done incredibly well with that, too.
The problem we're having is that she just harasses Gypsy Rose constantly, mostly wanting to play but her play is a bit rough and Gypsy Rose is older. And two big dogs hurtling thru the house isn't a good thing (both are house dogs, we don't do yard dogs).

I know in part it's Dakota's fear of not getting enough, whether it be food, attention, whatever, due to her history. She's happy with us but I don't think she likes sharing us. So she harasses Gypsy Rose, just bugs her nonstop like a bratty little sister. She doesn't try to hurt her, she just pesters.
She knows it's not acceptable to us but on this issue, we haven't found the trick in getting her to obey us for any length of time. We might get her to back off and go do something else but 10 minutes later, she's back at it.
She's now about 10 months old, full of energy, hormonal (but fixed), and prior to us, I don't think she'd ever been in a house. So it's all new for her. We do not have a fenced yard so she's limited to walks for exercise.
Gypsy Rose doesn't help... she figured out that if she instigates Dakota to bother her, Dakota gets in trouble. So we believe Gypsy Rose is egging it on.
Can anyone offer any suggestions on how to get the two dogs to stay calm around each other? Not go into high gear?
Shari

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Okay, here goes... Many years ago I adopted a dog from the pound, she was the most incredibly good dog ... two big dogs hurtling thru the house isn't a good thing (both are house dogs, we don't do yard dogs).

I have had the same sort of thing with my male dog Muttley, who is about 3, and female Lucky, who is about 2. At first it seemed like Lucky wanted to play, while Muttley wanted to chill out, but then it seemed more like Muttley was resource guarding me from her attentions.
I know in part it's Dakota's fear of not getting enough, whether it be food, attention, whatever, due to her ... We might get her to back off and go do something else but 10 minutes later, she's back at it.

Same here. I could get them to "knock it off" for a little while, but then they'd stare at each other and it would start again. It was worst when they both got on the bed (especially when I was also there).
She's now about 10 months old, full of energy, hormonal (but fixed), and prior to us, I don't think she'd ever been in a house. So it's all new for her. We do not have a fenced yard so she's limited to walks for exercise.

I found that they seemed to play/fight until I asked them if they wanted to go out, and then they both stopped and waited for me to put on their leashes and go for a while. I think they had me trained.
Gypsy Rose doesn't help... she figured out that if she instigates Dakota to bother her, Dakota gets in trouble. So we believe Gypsy Rose is egging it on.

I would usually tell Muttley to stop it, but sometimes Lucky would give him a little nip and start it up again. I think they mostly enjoyed it, although it looked and sounded pretty rough (two 75 lb dogs).
Can anyone offer any suggestions on how to get the two dogs to stay calm around each other? Not go into high gear?

Yesterday and last night I let them continue their interactions with only a few timeouts when it seemed to be getting out of control. Finally they both seemed exhausted and plopped on the floor. They've been much better behaved today.
They seemed to get along well during the first 2-3 weeks, which is supposedly the "honeymoon" period. Then for about the next 6-8 weeks until now, it seemed to be getting worse, with occasional bright spots when I thought all was OK. Of course, they are both adult dogs, while yours is still an adolescent, and all dogs are different. But mine were both street dogs rescued from the pound, so they might share similarities in their early history.
I make sure both dogs get a lot of attention and affection. I think they both want to please me, most of the time. I've been fairly lax with training, and I've done some things that others say were wrong, such as letting them both eat from one plate, or sharing a bone. But maybe that also helped them work out their issues with each other?

I'm not an experienced dog owner, particularly with multiple dogs, but for now, at least, there is peace in the den.
Paul, Muttley and Lucky