I might be overstepping the mark a little here, but as a pet owner myself this is really starting to bother me.
Our neighbours have 2 fairly small mongrel dogs, one about 3/4 years old and the other about 6 months old. I have NEVER seen them walk either of them. Normally I wouldn't give it a second thought, but they've recently been coming through a hole in the fence into our garden and trying to intimidate our cats. I also worry about when our daughter gets a little older and will want to play in the garden, a lack of exercise and stimulation for a dog can cause a lot of aggression.
Is there anything I can do? If I complained to the RSPCA, would they do anything or even care? I just don't understand why you'd get a pet in the first place if you had no intention of looking after it properly?