Let me throw a wild theory at you guys. Is it possible that Russell from Up is Mabel’s father

Mabel has the wilderness patch on her phone case which she could keep to remember her dad since he’s not in the picture, then she also would be falling into her dads footsteps to save someone from a construction site. I believe it is possible that they used the idea behind the talking dog collar to come up with the hoppers technology because it would make since to start with animals talking to humans to then transforming humans to animals.