My 13.5 year old Cav is pretty healthy by all considerations, but recently he has had what I consider "iffy" moments. He seems to shake at times (he will be just standing there and his body shakes); the other thing he does is pace. He does this before his feeding time, when he can't find me, and, in general, when he seems to be nervous. This happens fairly frequently anymore. He also loses his balance in that he will be "pacing" along the side of the bed (when I'm half asleep and he wants to be fed), and he will slip off the side and fall to the ground; he also falls off the top of the couch when he is sleeping and has "fallen" down steps when he is racing to get his food. Any tips for controlling his anxiety that seems to be at the root of all of these problems?