I am not a happy puppy is an English idiom and cannot be translated into German in a way that conveys it's meaning.
German puppy would be translated as der deutsche Welpe...... Unless you meant to ask for the translation of "German Shepherd puppy" which might be Deutsch Schaferhund Welpen.
Junger HundWelpe (puppy)
Assuming you mean "how" to say happy in German, there are a couple of different ways: Froh and gluecklich.
Happy Friday in German is glücklicher Freitag
happy - glücklich Also fröhlich, froh
Happy Puppy was created in 1995.
The German word for puppy is (der) Welpe.
In Pennsylvania German, you can say "Ei glickliche Geburdsdaag!" to wish someone a happy birthday.
happy married life = glückliches Eheleben
Frohes Neues Jahr.
Die glücklichen Kinder.
"Happy Saint Patrick´s Day" in German is: Fröhlichen St. Patricks Tag