The Letter V
The Letter V could stand for Voracious, as in Puppy's appetite. Or Vivacious, as in Puppy's sparkling personality. Or Vibrant, as she makes our lives with her mere presence. Or Va-Va-Voom, which is what the male dogs at the dog park seem to think of Puppy.
She's happy with all those words, as they are all positive.
Puppy enjoyed her Vacation with her friends, but look how glad she is to be home.