can level in max charge and charge regen they seem to have high base weight making them great backpacks "shoulder mounted dinos inventory is only half applied to you" unless you need nameless protection a glowsticks a saferlight source since these guys die easy their great for providing charge around your base if you get a big group of then and set them to turn on when full the extra player detection settings may drain charge faster when on "unconfirmed" they will fight if you whistle attack but suck at combat.
These guys are incredibly useful from being a portable light that works for a long time to being a cute little friend in hardship. Do not kill these, they are too cute, I died to a basilisk on a mana and the bulbdog jumped off and ran strait for it... I now have a graveyard near my base. R.i.p Bulbdog dude