And to complete a particularly cultural PoV, there are many people eating "pet" chickens, "pet" guinea pigs, goats, et al about the world.
Good arguments, particularly in Australia, for eating wild pigs, clean skin bulls, camels, donkeys (mainly for pet meat IMHO), etc. Kangaroos, unculled, explode in number past the sustainability of their landscape and litter the ground with bones - humans estimate a cull target and shoot to reduce populations, only eating a few themselves (leaving many on the ground for "nature").
I'm native, and my ancestors were called "dog soldiers" because we would bring dogs with us to war, and when rations got a little tight we would throw fido into the pot. Eating dog is generally considered abominable when you love them as pets but it's a common thing in many societies and not wrong.
I will say though, I would only ever consider eating a dog in a life or death situation.
If there was no absolute need for me to eat a dog then I would not do it, and even if there were it would be a difficult moral dilemma for me that should I survive could possibly haunt me for life, but for my ancestors it was a common occurrence.
And there are plenty of people who would vehemently argue that eating their pet puppy is very, very, very, different from eating a plant.