Another theory, not sure if this pup is theirs tho, but imo the hints could lead to a bird themed pup!
I think this might be
Kazins pup!
Does your pup prefer day or night? — daytime!
Most birds are active during the day
Does your pup prefer fruits and veggies or is it a carnivore? — Definitely fruits/veggies, maybe bugs...
A lot of smaller bird species have fruits and veggies in their diet as well as insects/bugs
How would your pup feel about a birthday party? — I think loud noises would scare them...
Have you ever made a loud noise close to a bird? They usually fly away scared
Do they prefer to be alone, or in a group? — Groups!
A lot of bird species travel in flocks/groups
What's their bedtime routine? — A super early bedtime, and a super early riser - with the sun!
Birds usually wake up an hour before sunrise to sing their dawn choruses, so super early rises checks out. And they go to sleep with the sunset, so defenitely an early bedtime.
What is your pup's favorite season/weather? — Spring probably
The season that birds mate and lay eggs
accounts/viewgroup.php?groupid=1822359&userid=3262In this group one pet can be found, the bird looking staff pup with a lot of egg items and the name "Egg :)" Just a coincidence?