To me, it sounds like Moses became fixated on the leash and just got overly excited about it. I know how crazy they can seem when they're like that (my Bowzer used to get that way with basketballs, and Rufus can get that way too), but I really don't think her bulldog was "out of his mind".
The yelling and screaming probably just added to his excitement too. Really, since Moses has been such a healthy bulldog, I don't think that he has anything like a tumor or rage syndrome; to me, he sounds like he was just an overly excited, young, energetic bulldog.
I agree with the comments on obedience training; it would be a good bonding experience for your friend, and also help her to understand her alpha role with her big, strong boy.

Because I wasn't there I can't speak 100% about your bullies actions or his intentions, but I can tell you that Sanford LOVES to do this.

He waits until we're returning from a walk and we reach the end of the driveway and as soon as I unclip his leash it's "GAME ON". He immediately gets into his "downward dog" position and wants me to play chase, and tug and pull with him and the leash which I always do, it's our little way of ending our walks.

He's done this since he was a baby because when we would come back from walks in the city (NY) I would let him drag his leash behind him in the hallway of the apartment building and then I'd pretend to chase him which was just a fun game for him and he loved it. So we'd play pull and tug and I think that's where he got it from.

And YES, Bullies CAN jump which is why I never pull the leash up above my waist to get it away from him because I don't want him jumping up on me or hurting himself.

He's almost 4 yrs old now so he's a little harder to handle than he was when he was a baby but when he gets too crazed I grab hold of his collar and tell him very sternly "KNOCK IT OFF" or "THAT'S ENOUGH" and he manages to get himself back under control.

I guess because he's done it before I'm not concerned about it but he's also never exhibited any behaviour towards me that I couldn't control so I'm not the least bit afraid of him.

I probaly didn't supply you with anything substantive on this post except to tell you that Sanford does this too and I know he doesn't have any medical issues or medication issues that are the cause.

Good luck.

and his behavior returned to normal that this was a behavioral thing associated with the "play" circumstances and not a physical thing like illness. I would be careful for a while in allowing him to get over excited with his ball. I had a bitch--sweetest thing alive--unless you tried to remove her ball after she had been playing with it. She would turn into Cujo. We finally did a lot of training before she was allowed to have a ball

Miriam Olesen
http://www.omegabulldogs.shutterfly.com/

a visit to him regarding this epeisode will be a total waste of time. Is Moses neutered? If not, thi might be the time to consider it. I also recommend an obedience class--as much to teach him you are the pack leader as to see what his behavior is like in a group of strange dogs.

Miriam Olesen
http://www.omegabulldogs.shutterfly.com/

first of all the rage sydrome your talking about, it happens in dobermans and is a form of eplipsy, as others have said, you have a big dominate bully, some times wilson will get my face and start kicking his feet barking, as soon as i stop laughing he stops.
i can hardly believe some times how far he can jump, and if this dog did not "attack the owner" but was jumping after the leash????? he was just being stupid in the park, dont euth him ok.

and I would get him to the vet and also keep him apart from the other dog. If that is what it is he is not aware of what he's doing and has no control of it.

Betty,MightyDog,Mardi,Marcus and Candy

and to be monitored, this is not normal behavior i would worry about a brain tumor or other neurological problems

Vicky,
Bosco, Bella, Breve' & Holly

http://langagerbulldogs.tripod.com

PHOTOS ARE PROPERTY OF LANGAGER BULLDOGS, YOU MUST HAVE WRITTEN PERMISSION FOR ANY USE OF THESE PHOTOS FROM LANGAGERBULLDOG.

I know that sounds weird. My newfie was an epileptic, and whenever he would have a seizure, after he came out of it, he reacted completely different, confused, agitated, and would run up the stairs, where normally, he'd never go upstairs. He never had aggressive tendencies though. But he was not his 'normal' self.

I completely have no idea what could be going on with your friend's pooch though. I'm sorry. Sounds like his brain 'short circuited' for lack of a better term...

Wish I knew Deb.... so sorry.... I wish her the best of luck, and some answers....

all my thoughts run to the "physical" possibilities...Ineke has also suggested looking at the "behavioral" possibilities, and that too has great merit.

Strange and aggressive behavior is frequently seen with steroid use.

If that is a 'dead end' then I would certainly look into some calming preparations...there are some available in the holistic venue that might be considered rather than using ACE or similar but again I'd check with the vet because if the dog is on any medications some herbal preparations do interfere with absorption, etc....know that from my own cancer treatment.

Lastly I'd also evaluate his 'sugar level' as to when this dog is fed, and considering changing his feeding to smaller and more frequent feedings to see if that alters (levels out) his temperament. A blood panel would also show any dramatic abnormal readings in major functions.

and being a belated teenager, entering puberty.

This is what I think happened. Grabbing the leash is fun, is real fun, especially for a young Bulldog. It appeals to what a Bulldog is made for, hanging on to a Bull!
For some reason it is the first time he does it, or the first time he chooses to find out what happens if he doesn't let go. And hooraye! Mum goes wild! She is scared! That is fun! Let's try what happens if I growl, and pull the leash some more!

And so it runs out of hand! Because he is so into it, he starts panting and foaming at the mouth (due to the power it costs to hang on and to growl and don't forget the exitement!).

NO, Moses didn't turn wild, Moses tried what all young dogs do, he tries to be the leader.

I would advice your friend to enter dogtrainingschool to work out who is really in charge. Find a school that uses dogfriendly methods.
She shouldn't change the way she keeps Moses and Ariel together, because I think that Ariel has done a nice job, keeping the youngster in check up till now. If she feels unsure about taking them both to the dogpark, let her take them one at the time. It is better for Moses too, to learn to stand on his own feet and not relying on Ariel.

Good luck, it will improve!

Ineke and Zorro (who is into puberty aswell!)

I know a sudden change in behavior can be related to a brain tumor. I hope this is just an isolated incident and the dog is fine.