<human>: Hi, this is my first ever post so bear with me if you can.

We've had a beautiful little 1.5yo staffy cross for a couple of months now. She's one of three dogs we have, and off-lead she immediately gets along with every dog she's had the chance to meet. She's extremely playful and affectionate, and I've never seen a dog wag her tail so frantically nor easily.

At home, we haven't seen any signs of aggression or fear in her. She doesn't seem to guard anything, to the extent where she would happily let you/the other dogs take food or toys out of her mouth. She also doesn't seem to get startled nor display any signs of discomfort. She sleeps soundly in the presence of anyone.

Now, the issue... She is extremely different on lead with strange dogs present. It's so bad that we had to pull her out of obedience school for being disruptive. She barks at a painfully high pitch with her butt in the air and runs around in circles at my feet the entire time. She doesn't listen to any commands, even with food rewards (she is not bad at commands back at home and usually loves food!) I can't get her to look at me at all. 

Additionally, when those dogs get too close, she tends to pounce on them or get overly excited, which doesn't always end well. She even almost got into a row with one of our other dogs while they were at obedience training, and they are usually the best of friends. 

I know its all very crazy and exciting to be around so many dogs, but we really don't know what to do to calm her down in that situation. Nothing seems to work. It's like she is a different dog altogether! I can't really figure out if she's doing it out of excitement, stress, or fear, but she never exhibits these intense behaviors normally. She rarely barks at home.

If there aren't strange dogs around, she will pull on her lead but only lightly. 

We would really love some advice, because she's a sweetheart but this is just embarrassing. I also don't want her to ever get into a sticky situation with a less than friendly dog due to her hyperactivity.

Condense the text into a few key points
<bot>: Dog overly excitable on lead around other dogs. Won't listen to us at all, so we can't take her to obedience class without causing a ruckus. Please help!