Sentience is important because it confirms that animals are aware, emotional and feel pain and pleasure. Why does a dog wag it's tail and nuzzle if you stroke or pat it? Why is a bull in a bullring so aggressive, why do birds and other animals deliberately avoid us? A sheep will come willingly to the farmer but won't to a stranger. There are hundreds of ways in which to prove an animal is sentient. As regards the question ,should we keep dogs? I see no harm in that provided they are looked after properly and are happy to be with you. They are mans best friend after all. I know some people have a different view and I respect that. I've been vegan from birth for 79yrs this year and we've always had dogs. I wouldn't have missed their company and enjoyment they gave us for anything. I have a GSD right now who is 14yrs old on 1st June. If I hadn't had him after my wife passed away in 2019 I would have cracked up. He's been amazing. But he is the last dog I will have, as at my age, if I had another one it could outlive me and that wouldn't be fair.