The suggestion/implication that soda's are made by harming puppies is exactly that: an implication, innuendo.
In this case, there's a clear suggestion that other soda makers are doing something that might be illegal, so I'd use the word innuendo or insinuation over implication here (as implication is a more general and neutral term anyway).
Some explanation-by-example thingy's:
Your example sentence implies the soda can it is written on doesn't harm puppies, where other producers do.
Those other manufacturers will react angrily, saying competitor NoPuppyPop's insinuations are completely unfounded, false and malicious.
The word malicious is why I'd say insinuation/innuendo is the word you're looking for
If you want a neologism for some reason: insanuation (insane + insinuation) is a common typo, or at least, so I hope. I did a quick google search:
Furtive lies and insanuation
All designed to tarnish my reputation
And devised by you without explination
Tell me why, why you spreading all these lies? mmm
some lyrics found on a Polish site