Because of Spike's bond being different than the CMC's bond.
That and its his choice to wanting to hang out with his sister's friends
Making Spike a dog because they can't figure out his relationship with Twilight is downright moronic.
Due to they are answering with "he's a pet, lol". Its like someone struggling to find an answer but end up blurting out something really dumb instead.
Really, just say he's her brother in the human world. Its that bloody simple.
Its not worship territory. Because loophole, like Wallflower doesn't even know about him(due to either Sci-Twi's hypocrisy leading her to not bring him or he's stuck in a backpack too much)
And her specifying the stone to take only the students and teacher's memories, Spike isn't a student. And yet the writers squandered that.
Even with the oppertunities Spike has as a dog, they muck it up.
He would still have a bond with the other Mane 5, problem is the writers muck it up by not properly exploring it.
At least Fluttershy got powers, be part of that chosen ones bond, GOT TO DO STUFF and be included.
Spike can't have that all because he's stuck as a freaking dog.
Unlike the Mane 5, its dumb how Spike didn't get to meet his counterpart since dragon Spike and pony Twilight were the only ones from Equestria(that has counterparts) that visited the human-world.
Isn't really fair Sci-Twi met hers TWICE but Sci-Spike doesn't get to not even once.
Sci-Twi would just have Owlicious. Pony Twilight literally has an owl as a pet.
Spike did not need to be a pet. Or at least have Sci-Twi use a robo-bird or something, since Pinkie had a plushie in place of Gummy since she can't have a real gator unlike her pony counterpart
Not really. Since Spike is still badly restricted HARD.
Can't even interact with anyone outside of the Rainbooms.
Them choosing to not bring Spike because of fear is really not fair for him really.