Here are a few description options for the WordPress post_tag “快樂狗狗” (Happy Dogs) in Traditional Chinese, ranging in length and focus:

**Option 1 (Concise & Direct):**

> 關於快樂狗狗的一切！ 探索關於狗狗的歡樂事、正面能量與幸福瞬間。
>
> *English Translation: Everything about happy dogs! Explore the joy, positive energy, and happy moments related to dogs.*

**Option 2 (Slightly more descriptive):**

> 尋找關於狗狗的幸福和快樂？ 這個標籤收錄了所有關於快樂狗狗的文章，包括牠們的可愛行為、有趣故事，以及如何讓你的狗狗更快樂！
>
> *English Translation: Looking for happiness and joy related to dogs? This tag collects all articles about happy dogs, including their cute behaviors, fun stories, and how to make your dog happier!*

**Option 3 (Emphasis on Content Variety):**

> 快樂狗狗的世界！ 這裡有分享狗狗歡樂的照片、影片、故事，以及關於狗狗健康、訓練和玩樂的各種資訊。 讓你的心也一起融化！
>
> *English Translation: The world of happy dogs! Here are shared photos, videos, stories about happy dogs, as well as various information about dog health, training, and play. Melt your heart too!*

**Option 4 (Focus on Community):**

> 關注快樂狗狗，一起分享狗狗帶來的幸福！ 這個標籤匯集了關於狗狗的快樂分享、經驗交流，以及任何與笑容、玩樂和可愛狗狗相關的內容！
>
> *English Translation: Follow Happy Dogs and share the happiness dogs bring together! This tag brings together happy shares, experience exchanges, and any content related to smiles, play, and cute dogs!*

**Which one should you choose?**

* **For brevity:** Option 1 is the best.
* **For a more general audience:** Option 2 or 3.
* **If building a community:** Option 4.

Remember to choose the description that best reflects the content you’ll be tagging with “快樂狗狗”. Consider also adding related keyword tags to help search engines find your content!