Don't worry about this small issue, it's just a chihuahua compared to bigger problems.

chihuahua 原指一种体型很小的狗品种"吉娃娃"，这里用作比喻，形容某事物像吉娃娃一样微小或不重要。这种用法通过将小体型犬种的特征引申为"微不足道的事物"的比喻意义。