We have a 10yo JRT cross. This last few months her anxiety with some noises have increased, and now every night she will bark for around 20-30 minutes before eventually settling down. We’ve put the radio on, bought a nightlight, used calming music, tried valerian and skullcap etc etc and nothing is helping. The vet has suggested it could be the start of dementia but not sure if there’s anything we can do?