These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
Fridge Logic: How does your puppy howl with a tennis ball in its mouth?
How do they get so dirty by staying inside for three days? There's no sign of them causing a ruckus or leaving.
Most Annoying Sound: It's fun to use the mic to call your puppy by name. It's a lot less fun to have to listen to someone else repetitively yell commands at their DS.
Sweet Dreams Fuel: They're games about puppies. 'Nuff said. The 3DS games take this even further with improved graphics (including realistic fluffy fur) and the inclusion of kittens.
Tear Jerker: If you ever choose to donate one of your dogs, the game asks a couple of times if you're sure you want to. Upon choosing yes, you have to sit and wait for a while, looking at your soon-to-be-gone puppy on the screen, before the process completes and they're gone forever...
Uncanny Valley: Some of the Miis you might encounter on walks might as well have come out of a random Mii generator, as they can have creepy smiles on their faces.