Inugami Kai
A manga about a boy who befriends a mysterious talking dog that uses retracting forehead blades to fight other creatures.
So apparently this is a recent re-release of the original Inugami series that originally ran in the 90′s, which explains some of the dated artwork.
I personally thought this was alright. My main complaint was that the animal creatures using transforming blades and tentacles really seem like they’re aping off of Parasyte. The story setup also seems similar as both have the benevolent alien creature pair up with a human friend.
If you liked Parasyte then you might enjoy a similar story with this one.
~dakazu