Here are a few options for the WordPress post_tag description, designed to be concise and helpful, as well as using Traditional Chinese:

**Option 1 (Focus on symptoms):**

> 狗狗過敏 (過敏反應)。了解您的愛犬是否出現皮膚瘙癢、打噴嚏、流淚等過敏症狀。尋找過敏原因及解決方案。

* **Translation:** Dog Allergy (Allergic Reaction). Understand if your beloved dog is showing allergic symptoms like skin itching, sneezing, and watery eyes. Find out about causes and solutions.

**Option 2 (Focus on causes and treatment):**

> 狗狗過敏 (原因與治療)。探索狗狗常見的過敏原，如食物、環境因素等。了解如何診斷、治療和預防狗狗過敏。

* **Translation:** Dog Allergy (Causes and Treatment). Explore common allergens for dogs, such as food and environmental factors. Learn how to diagnose, treat, and prevent dog allergies.

**Option 3 (More general, good for broadening content):**

> 狗狗過敏。涵蓋所有關於狗狗過敏的資訊，包括症狀、診斷、治療與預防。

* **Translation:** Dog Allergy. Includes all information about dog allergies, including symptoms, diagnosis, treatment, and prevention.

**Which option to choose?**

* If you are creating very specific articles which focused on symptoms, the first is better.
* If you are writing content that centers on treatment and causation, choose the second
* If your content is diverse, cover everything, and are aiming to make a great resource hub, the third option is best.

No matter the choice, the descriptions provide a helpful context for anyone browsing your blog! Remember to keep it concise, descriptive, and use keywords that your target audience would search for.