I have several dogs, I found yesterday that I can't make them stand up, I don't know since when this has been an issue because I hadn't tried for a while. When taming new ones this doesn't seem to be a problem.
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Did you switch Minecraft accounts? if so, those dogs will still belong to your other account and you will not be able to make them stop sitting. Like on a server, you can't control other people's dogs.
Get the wolf's data by standing near it and using
/data get entity @e[type=wolf,distance=..5,limit=1]
.When the command executes, copy and paste the NBT here. (the launcher log should help)