And horses - i had a similar relationship with my horse, though he was'nt so forgiving as my dogs - I landed looking up at the sky plenty of times!
Dogs. In general but especially my own two sheepdogs. Not just the unconditional adoration but they are so tuned into me i feel guilty when "I'm not so good upstairs" because it affects them too - they get anxious with me! Plus I work them and to be a part of a human-dog-sheep relationship...it's somehow humbling and complete.