Not sure there is a right or wrong way, but when we do a jack-o-lantern every year, (once gutted) Kiwi likes to sit on the edge of the pumpkin and nosh on the insides. I'm not sure about giving them the stringy pumpkin guts, but the rest is safe for them to eat and rip up. Seeds, I am pretty sure, are simple to roast in the oven.