While at the vets last week, we met a couple with a cavalier who was 13 yrs old, we had a long wait , the vet was running late which did not help Jasper, he hates the vets, as soon as we get through the door he can`t wait to get out, so it was good for him when this cavalier appeared, we started chatting and their dog has been on heart tablets for 4 yrs, he actually looked quite healthy, although they said he was`nt fussed on walks anymore, he was quite big and they actually asked if ours was a cavalier as he has such a small head, we thought 13 was a good age for any dog really especially a cavalier not that I know too much about it as this is our first dog.