The proof is in the puppies.

Hello all,

I am struggling to accurately translate this slogan, "The Proof is in the Puppies."

The context: the slogan is for a dog training company, so the slogan needs to reflect that. The slogan is a way of saying that the puppies they train are the proof that the program works.

I only took 1 semester of Latin, so this is what I have:

Argumentum est in catellos.

Is this accurate or am I translating too literally? Also I have no idea if the declensions are right. Any help would...

The proof is in the puppies.