1- Dreaming of a dog lead (See Also: Harness, Halter) would symbolise the connection between ourselves and our lesser nature.
To have lost the dog lead would indicate a loss of control. Leading someone in a dream pre-supposes that we know what we are doing and where we are going. Being led suggests that we have allowed someone else to take control of a situation around us.
2- Leadership qualities are not necessarily ones that everybody will use. Often we can surprise ourselves in dreams by doing things that we would not normally do, and taking the lead is one of them.
3- We are able to take authority by- virtue of our spiritual knowledge. This can be done with humility and without ego.
[1]