Explain it in a format this way.
If you’d not think people should keep pets, say something like this.
“I do not think people should keep pets because, (your reason) I think this because, (proof and evidence of your answer). In conclusion, I think people should not keep pets.
If you think they should, use this format.
“I believe people should keep pets because (reason), and (reason.) I think this because (proof and evidence of why you think this). If people keep pets (reason.) Therefore, In my opinion people should keep pets.
Hope this helped!