Dog
Dogs present significant logistical constraints. Air travel requires advance booking, veterinary certification, and carrier dimensions that comply with airline regulations. International relocation demands quarantine protocols, microchipping verification, and paperwork sufficient to discourage all but the most determined. Spontaneous weekend travel becomes an exercise in identifying pet-friendly accommodation or securing reliable care.
The average dog weighs between 10-30 kilograms, cannot be stored in luggage, and requires feeding, exercise, and elimination opportunities regardless of schedule inconvenience.
Happiness
Happiness, being a neurological state rather than a physical entity, theoretically accompanies its possessor without dimensional constraints. It requires no carrier, produces no customs declarations, and weighs precisely nothing. The happy individual can board aircraft, cross borders, and navigate security checkpoints with their emotional state entirely undetected by scanning equipment.
However, this portability remains theoretical for most humans. Research indicates that happiness frequently fails to survive airport security, delayed flights, and the general experience of modern transportation. The happy individual departing often differs markedly from the individual arriving.
VERDICT
Happiness theoretically travels without restriction. Dogs require documentation, carriers, and advance planning.