Squirrels in dreams represent a need to store things for use in the future, much the same as the squirrel would do during before the winter so it can feed itself during hard times.
What it is you need to store, or save up, depends on your life – it may often be money, but it could be something less obvious such as positive feeling towards yourself from other people, perhaps by being kind to the people around you.
Squirrels in dreams can also reflect a hording personality, or just an aspect of your personalty – perhaps you have too much of something?