Here are a few options for the description of the WordPress post tag “老犬” (Old Dog) in Traditional Chinese, ranging in style and purpose:

**Option 1: Concise and Informative (Good for SEO)**

> 關於家中年邁愛犬的資訊，包括照顧、健康、飲食等相關內容。
>
> (About information regarding elderly dogs in your home, including care, health, diet, and related topics.)

**Option 2: Slightly More Detailed**

> 深入探討老犬的日常照護、常見疾病、飲食需求，以及如何讓您的愛犬安享晚年的文章集合。
>
> (A collection of articles delving into the daily care, common illnesses, dietary needs of old dogs, and how to ensure your beloved dog enjoys its golden years.)

**Option 3: Focus on Sentiment and Care**

> 用愛呵護老犬，記錄寶貝陪伴我們走過歲月的點滴。分享經驗、提供資訊，為您的老朋友打造一個溫馨、舒適的晚年生活。
>
> (Caring for senior dogs with love, recording the moments of our treasures accompanying us through the years. Sharing experiences and providing information to create a warm and comfortable later life for your old friend.)

**Option 4: Emphasis on Practical Information (best for a practical blog)**

> 我們分享關於老犬的實用資訊，如老年犬的健康問題、護理技巧、飲食建議、訓練方法等，讓您更好地照顧您的年邁伴侶。
>
> (We share practical information about senior dogs, such as health issues, care techniques, dietary recommendations, training methods, etc., so you can better care for your older companions.)

**Recommendation for choosing the best option:**

* **Consider your blog’s focus:** If your blog provides practical advice, option 4 might work best. If you focus on emotional connections and storytelling, option 3 might be better.
* **Think about keywords:** All options include relevant keywords. Consider which ones will be most important for your SEO.
* **Keep it short and to the point:** WordPress tag descriptions are generally not long. Focus on conveying the key meaning in a clear, concise way.

When submitting to Wordpress, ensure the description is under the appropriate field that allows you to customize the Tag description so it is displayed on your website. Remember to save your changes. Good luck and enjoy writing about “老犬”!