I tried spawning some in with the console, and they were elk/deer. Other NPCs using the same dog model have been fine, but for some reason stray dogs don't work.
I've checked all the mods I use, and none of them should be causing it. Is there a way to change/fix this?
EDIT: I turned off a couple of sound mods, and the stray dogs are working fine again. So nevermind I guess.

EDIT 2: Turns out the models are working, but I still can't interact with them at all. They just bark.