So initially I thought it's an animation error but...
Look at Puppycorn:
Every time there's a water fun episode- where everyone wears swimming attire, Puppycorn's collar loses its spikes.
Does that mean- that it's not Puppycorn's collar after all! That's what his neck actually looks like without it?
Comment down below what you think about this :)
Whelp, let's look forward to seeing Dr. Fox without glasses, Hawkodile without his shades, Master Frown (and all the other Doom Lords XD) without his (or their) cloak(s), Master Misery's eyes, the characters' family and backgrounds, whether or not Hawkodile and Dr. Fox will be official... and many other unrevealed secrets XD