Pound Cake

So I have two dogs.
 A Lab mix named Elinor, she's another post entirely, and Neville- my Pembroke Welsh Corgi. 

My Neville is the cutest thing in the world and he is the perfect dog in every way except one: he gains weight FAST.  It's like I blink and he doubles in size.  Something you have to understand about corgi's is that they get to a certain age and then pack on the weight like little champions.
 Like every true pet lover I call him cute little names.  Mine happen to be food related and I took pains to describe his growing bulk in the past year or so through edible creativity.
He started off as a twinkie, being roughly the same shape and color as the cakey pastry:

This is his first puppy picture.  God, he's so freaking precious.

I had to call him a muffin a year later because of his expanding girth:

He had to grow into the ears...they came that size.

And finally I had to break down and call the little chow fiend a pound cake:

This is Neville at 30 lbs.  I swear we ration his food reasonably, but it doesn't help.

He fell asleep with his bone in his mouth one afternoon while I was writing.  When he woke up the bone was stuck like that and he panicked for a few minutes before I could catch him and hold him down long enough to pry it out.
I don't know what I'll do for gastronomical metaphors if he gains more weight.  Anyone have any ideas?  How bout half sheet?  Like a half sheet cake? 
This is what Neville thinks of that idea:

"Oh Hell No!"