Update...

We have now narrowed our 100 ideas down to just 2:

Dog Mob (taken from flash mob concept http://www.youtube.com/watch?v=VQ3d3KigPQM)

Work to Home communication system (working title)

We are currently working on expanding and developing these concepts...

The idea we are most focused on is the dog mob, this idea involves a network of products which are placed in a number of homes. When anyone in the network wants to go out on a dog walk they simply activate the dog mob product and it sends a signal to every member of the network. This signal could be the sound of a dog barking, when they hear this sound they could all meet in a designated point and begin the dog walk.
As well as being a good social activity it will also make the users feel safer when out on a walk as they will be part of a large group instead of on their own.

If anyone has any views or ideas on this concept they would be greatly appreciated...