Here are a few options for the WordPress post tag description, keeping in mind readability and searchability:

**Option 1 (Focus on general content):**

> 分享關於長壽犬的一切！ 瞭解如何照顧老狗，提供飲食建議、健康提示和生活方式調整，幫助您的愛犬享受黃金歲月。

> _Translation: Sharing everything about long-lived dogs! Learn how to care for senior dogs, with dietary advice, health tips, and lifestyle adjustments to help your beloved dog enjoy their golden years._

**Option 2 (Emphasizing practical advice):**

> 關於長壽犬的實用指南。 探索飼養指南、獸醫提示，以及如何預防和處理老年犬常見的健康問題。 讓您的愛犬活得更久、更健康。

> _Translation: A practical guide for long-lived dogs. Explore feeding guides, veterinary tips, and how to prevent and manage common health problems in senior dogs. Help your beloved dog live longer and healthier._

**Option 3 (Short and sweet):**

> 關注長壽犬的健康、護理和快樂生活。 提供關於老齡犬的寶貴資訊，讓牠們擁有幸福晚年。

> _Translation: Focus on the health, care, and happy lives of long-lived dogs. Provides valuable information about senior dogs to ensure they have a happy old age._

**Option 4 (Focus on specific breeds or topics, if your content revolves around that):**

> 適合長壽犬的犬種、健康檢查、飲食建議等等。 了解如何照顧您的愛犬，特別是在牠們進入老年時期。 (Example: if your posts frequently cover specific breeds.)

> _Translation: Dog breeds suitable for long-lived dogs, health checkups, dietary advice, and more. Learn how to care for your beloved dog, especially as they enter their senior years._ (Modify the content of the last sentence to match your blog’s focus.)

**Why these options are good:**

* **Use the Tag Title:** All descriptions include the tag title “長壽犬” to boost relevance.
* **Keyword Rich:** Includes relevant words like “健康” (health), “護理” (care), “飲食” (diet), and “生活方式” (lifestyle) to aid in search.
* **Clear and Concise:** Easy to understand and tells the reader what the tag content is about.
* **Action-Oriented (in some cases):** Encourages users to read your content.
* **Positive Focus:** Emphasizes the positive aspects of caring for older dogs.

**To implement this in WordPress:**

1. **Go to your WordPress admin panel.**
2. **Navigate to “Posts” > “Tags”.**
3. **Find the tag “長壽犬”** (or add it if it doesn’t already exist).
4. **In the “Description” field, paste one of the suggested descriptions.**
5. **Update or Save the tag.**

Choose the option that best reflects the content you will be tagging with “長壽犬”. Good luck!