It should be ore wa inu de wa arimasen. I can see why people get confused between wa and ha tho. But ha is only pronounced as ha when it is in a noun, verb etc, like hanase はなせ or Hanae はなえ and it is used as a particle in this case so it should be pronounced with a wa so ore おれ wa は inu いぬ deで wa は arimasen ありません. There is another wa わ and that is pronounced as wa in a noun, verb, etc. eg. watashi would be わたし or wasureru as in わすれる。 this is all in hiragana bcuz lmao kanji is hard. And I doubt any beginners would know kanji. Sorry if it only confused you further
The title
It should be ore wa inu de wa arimasen. I can see why people get confused between wa and ha tho. But ha is only pronounced as ha when it is in a noun, verb etc, like hanase はなせ or Hanae はなえ and it is used as a particle in this case so it should be pronounced with a wa so ore おれ wa は inu いぬ deで wa は arimasen ありません. There is another wa わ and that is pronounced as wa in a noun, verb, etc. eg. watashi would be わたし or wasureru as in わすれる。 this is all in hiragana bcuz lmao kanji is hard. And I doubt any beginners would know kanji. Sorry if it only confused you further