Good cartoon adult series suggestion

Looking for a series for adults such as a show i watched on an ad in facebook where a dog is a satan and decapitates other. stuff like that

I'd recommend Invincible if you haven't seen it yet! It's only one season so far but it's been really good, especially if you like Superhero type stuff. It's a little more gritty than your typical Superhero cartoon.

Berserk is worth a watch aswell. The first season is very nice, the 2nd season is very weird

Crossing Swords is great... Make sure no kids are in the room though.

Invincible is pretty violent but quite fun and mature, sure worth a look

evangelion and invimcible pretty popular these days u should give it a try

Invincible, Castlevania, Love Death and Robots