The dog days of summer are a perfect time of year to assess your current employment situation. For many, the late summer offers a chance to take a breath from a hectic work year - whether you find yourself with some free time in the office or are out vacationing. Yes, loyalty is an admirable trait, but if you are not willing to at least consider other jobs, you might be missing a real chance for career advancement.
Of course, the grass is not always greener elsewhere, but you will never know unless you are willing explore other options from time to time. There may not be such thing as the absolute perfect job, but you might be able to improve certain aspects of your career that are particularly important to you.
So, after some self-reflection, ask yourself if you are content with your current job or is it less than what you had hoped for at this point in your career? If you hoped for more, now is an excellent time to consider a change because you may actually have time to update your resume, start networking, and perhaps test the market. Even if you are waiting for a year-end bonus, it is not too soon to start the process.