I can't keep my hand off the cookie jar. Its just too tempting to eating the sugary goodies all day.
I feel you. Is your jar glass or ceramic?
Its glass, so that I can see how many are left before I need to refill. I would hate to run out of cookies. 
What kind of cookies do you usually have in your jar? Cookie jars can also be used to store candy or dog treats.
I usually have chocolate chip cookies for myself and a separate jar for dog treats, as you said. 
In the United Kingdom they are called biscuit barrels which is kinda catchy
Biscuit barrels?! You can always trust our English friends to come up with the most absurd nick names.
Cookie jar
Cookie jars are utilitarian or decorative ceramic or glass jars often found in American and Canadian kitchens. In the United Kingdom, they are known as biscuit barrels or biscuit jars. If they are cans made out of tinplate, they are called biscuit tins. While used to store actual cookies or biscuits, they are sometimes employed to store other edible items like candy or dog treats, or non-edible items like currency (in the manner of a piggy bank).
Origin and history.
Cookie jars
album... I always figured you need to be 60 or better, to have a little more past, to put one of these out. I fought it for years." However, she changed her mind, realizing that "record companies can put out compilations without your permission" and concluded: "I wanted it done my way, so I jumped on board. Then, the less skeptical I felt about it, I started to feel a little proud."
Singles.
"Raise Your Glass" was