Good dog etiquette

I have a problem with my 11-month-old, female Whippet called Diesel, she is far too friendly!

On a walk, she always pulls on the lead to see other dogs or people to say hello. Also, Diesel always jumps up on people whenever she greets them - often people think she is being aggressive and are scared of her. It does not occur to her that it might hurt people who are smaller so she also jumps up on toddlers and children who are often smaller than her when she jumps up on her hind legs! This also happens with dogs - Diesel jumps on other dogs and scares them, it often ends in dogs thinking she is being aggressive when in fact she is the most friendly dog ever! I try getting her away with treats, spraying water at her - but nothing seems to work! She does not understand that people are scared of her when she is trying to be friendly.

Any ideas?

Anna Gorrod, by email