Sorry, but this puppy tends to bark at people wearing yellow clothes.
こんにちは！
ご質問ありがとうございます。
ご質問について、いくつか言い方が考えられますが、例えば、
Sorry, but this puppy tends to bark at people wearing yellow clothes.
とすると、『ごめんなさいね、この子犬は黄色い服を着た人が苦手なの』となります。
役に立ちそうな単語とフレーズ
bark at ～に向かってほえる
参考になれば幸いです。
This puppy isn't good with people in yellow clothes.
"この子犬は黄色い服を着た人が苦手なの"
- This puppy isn't good with people in yellow clothes.
- This puppy doesn't like people in yellow clothing.
謝罪の意味を込めて
- I'm so sorry, this puppy doesn't deal well with people in yellow clothes.
- I apologize, this puppy tends to bark at people wearing yellow clothes.
日本 
アメリカ合衆国 
