Lurcher nipping collie X on walks!

I have a 3 year old lurcher bitch called Jenny. I also have a welsh collie (Bessie), another lurcher (Danny), a greyhound (Holly) and a lab/collie cross (Otis). When we go on walks Jenny always runs after Otis to play then ends up biting him quite hard and sounds quite aggresive towards him. At home they're good mates and she doesn't do this with the other dogs. She pesters him so much that I have to put her back on the lead to stop her.
Does anyone know why she does this to Otis only? Is it to do with the pecking order? Otis is very very placid but even he has enough of her by the end.
What can I do to stop her? I don't want to muzzle her unless I really have to but I'm getting to the point where I may have to.
Any suggestions would be most welcome!

Its possible that she's just trying to get him to play and doesn't realise how rough she is being. Does he ever tell her off? Possibly if he did, that might help stop her (depending on whether she will heed his tellings off).

The only thing I can think of depends really on how obedient she is and how much she listens to you. My younger collie will try to nip my older one if the older one is getting really excited but just one look from me and an 'oi' and she knows to stop.

I'm wondering whether you could try her on a long line for awhile so that if she started to nip you could immediately reel her back in and make her walk by your side for awhile. Hopefully she'll eventually realise that nipping = end of freedom.

It sounds like she is desperate for him to play. I know a collie that does this and has actually drawn blood. I think back on the lead is a good call. She probably picked this up as she was growing up, adolecense?

You say Otis is very placid and it takes a while before hes had enough. How well socialised his she with other dogs than your own? What she needs is to try it with a stroppy dog who will give her a good telling off!

It could be a long process, what I would do is what you are. As soon as she starts to do it, very first attempt you say No and she goes back on lead. When she is calm again let her off and if she tries it again back on lead. Its a long process but hopefully will help. Another option is to walk them seperately. The more she does it the more she learns its fun. So avoidance is always an option.

Hope this helps.

Our new greyhound Holly doesn't take any nonsense from her and I'm hoping this will help. She does respond when I shout at her in a gruff voice but then she goes straight back to doing it again!!
I think you're right in the fact that she's desperate for him to play with her. She adores Otis but he just wants to mooch when we're out and she won't let him!!
I think I'll try the going back on the lead approach when she's doing it and see what happens. She's very very intelligent so hopefully will pick it up quickly.
Thanks for your advice folks