This Opening is call the Dog's Defense:

ruff ruff

woof woof

you do realise one move does not consitute an opening, defence or otherwsie

I thought the Dog defense was against the Collie system?

What is this bullshit? (Or dogshit would be more appropriate in this case.)

e4 c5 is the silcilian

and that is one move

God lord.....One move does NOT consitute an opening. It is the START of an opening, it is the concept (and or idea) behind that opening that consitutes it. 

It's like saying that 1.e4 e6 is the French defence.....

Yet 2.d4 a6 is the St. George Defence....

and 2.d4 c5 is the Fraco Benoni Defence....

and 2.d4 b6 is Owen's Defence

or even 2.d4 c5 3.Nf3 cxd4 4.Nxd4 is the Open Sicilian....

or even 2.d4 c5 3.Nf3 d5?! is a form of the Marshall Gambit (I think)

Chess is largely never about Black and White, there is always Grey

i have been attempting to play a reversed Black opening as White on the premise that if it's good as Black , it may be good with an extra tempo as White.

i.e., Reversed "Sniper" or Accelerated Dragon :  !......g6 , 2......Bg7 and 3......c5 and move order variations and delayed moves and transpositions. 

But as White,  I pre-empt with the useful !. a3 before implementing the above and it is named on Chess. com as Andersson's Opening , which , of course , 1.a3 , on its own ,is  ! 

  The idea is not new as it has been proposed and used by FM Charlie Storey at      Elo 2520 level .

What's in a name ?.....sometimes not much when an humongous number of variations and trans-positional moves are possible  and different openings have been attributed to and named after players while also having structurally generic origin names .

That has been modern medical anatomy practice also ,, e.g., Neurofibromatosis for  "von Recklinghausen's " disease  ( "Elephant Man "  , Re :  John Merrick )

While that is current practice ,  even that has confused less erudite practitioners e.g., naming that fleshy vestigial nasal-side corner eye tissue ,  nictitating membrane , as the ......... " pengwheculum " !!?....and its derivation ,

 "WHO  ( he/she/it  that is primal )  KNOWS " ! 

e4 d5 is the scandinavian

and 1.e4 d5 2.d4 offers the Blackmar Diemer Gambit and after which 2...c6 is the Caro and 2...e6 is the French......

what is difference between center counter and scandinavian

they're the same.

why do they have two different names

No idea

I would like to say "Who the hell cares?"....but I would hazzard a guess one names pre-dates the other. The "center counter" would have come first and the second would have come along when scandinavian players where credited for their work on the opening....

who named it the dog's defense

Schiller's "Unorthodox Chess Openings" calls this the "Carr Defense" (page 91). It weakens Black's kingside and lets White dominate the center. Schiller gives a blindfold game as an example of the difficulties Black makes for himself. I don't know who Carr was, but like Grob,  he got his name on a chess opening in a reference book. (Black lost after prolonged defensive agonies.)