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A pooch is a dog, said in a fond or slightly funny way. People call their own pet the pooch, or use it in light captions and chat. It is informal, not a vet’s word and not a rude word. It usually means a pet dog, not a wolf, and not a formal breed name. You would not write it on an official form; there you just say dog.
狗狗（口語、帶點俏皮，不是正式說法）
組成Origin uncertain. One unproven guess links it to Putzi, a German name for lapdogs (perhaps from Putz + -i, and the cute word putzig). Another guess says it is probably related to pouch. Nobody has a sure story.
原始詞典資料6 筆記錄
以下是外部詞典記錄的用法，原文照列，我們還沒有寫成教學內容。上面的說明才是我們自己寫的；有些用法可能上面已經講過了。
poochnoun詞源 1/puːt͡ʃ/
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informalA dog.
- She’s just been playing with the pooch ever since they got in the field.
- My thoughts are disturbed by a man and pooch trying to get off the front of the train. Despite hitting the door button, they refused to open.
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A dog of mixed breed; a mongrel.
poochnoun詞源 2/puːt͡ʃ/
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informalA bulge, an enlarged part.
- There's a pooch in the plastic where it got too hot.
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informalA distended or swelled condition.
- Her left sleeve has more pooch at the shoulder than the right.
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informalThe lower belly region; often in reference to the stubborn fat stored in the abdominal area.
- See also: paunch
poochverb詞源 2/puːt͡ʃ/
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informalTo distend, to swell or extend beyond normal limits; usually used with out.
- Inflate that tire too much and the tube may pooch out of the cut in the sidewall.
- There were rustling sounds from the tent and the sides pooched out as if they were trying to stand up.
資料來源：英文維基詞典 English Wiktionary（CC BY-SA 4.0）。 原文照列，未經改寫。