Excuse me for being radical, but I sincerely believe dogs have no place in our small light planes, unless VERY well secured. I must admit I am not a dog lover, and never having had one I am not acquainted with the race, but I understand no dog is guaranteed against the one incomprehensible moment of madness. This has provoked accidents bad enough with cars - in a plane I daren't even imagine what could happen.
And yes I know you Brits adore pets - I kept my first reply behind, out of respect.