Although there is now a shampoo called Rejoice, and every shampoo is supposed to be something at which one rejoices, the more sane, or conservatively educated, person associates the phrase "Rejoice greatly" primarily with "Rejoice greatly, O daughter of Zion" (Zechariah 9:9–10) from the Bible, and the coloratura soprano aria of that name, which is a musical setting of those words, in the Messiah by Handel. Please look it up - both the Bible and the video of the aria. It is not such a good idea to use it with your dog. I think people (journalists) use "rejoice greatly" to describe moments of political and sporting victory, of religious contemplation and worship, and of personal affection. Don't be a shampoo commercial. Use "rejoice greatly" sparingly and advisedly.

Just say, "My dog is always happy to see me when I arrive home."

Find examples below: 1) My God is greatly to be praised. 2) My guest rejoiced greatly during and after my birthday party. 3) The fire outbreak was greatly enormous. I have three (3) Language Groups on WhatsApp: English, Spanish and Yoruba. They are a mix of native and non native speakers. Message me if you want to join any of the Groups. Thanks.