It's the pitbull and transdogrifier from the fallout 4 creation club. I have an add-on mod so he can wear bandanas and armor too. That one is linked on the main description page.
I'm a new-ish modder and haven't played around with converting to ESL's yet. I tend to merge my plugins with this: https://www.nexusmods.com/skyrim/mods/69905 It works with Fallout 4 too. There are tutorials on youtube for it.
Or you could try this: https://www.reddit.com/r/FalloutMods/comments/74e892/fo4_psa_tutorial_for_converting_small_mods_to_the/
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Either way nice work on this, it makes life a little easier without being downright overkill, thanks.
https://www.nexusmods.com/skyrim/mods/69905
It works with Fallout 4 too. There are tutorials on youtube for it.
Or you could try this: https://www.reddit.com/r/FalloutMods/comments/74e892/fo4_psa_tutorial_for_converting_small_mods_to_the/