I second this. I used to have constant worry that something was wrong with my dog and nightmares of her dying horribly. It turned out to be a symptom of depression. I did some EMDR, started taking vitamin D and temporarily went on an antidepressant (for 6 months), and all that chronic worrying and sadness over my dog went away. Do I sometimes get sad thinking about her being gone? On occasion. But it doesn’t consume or interfere with my life, or mental health, any longer. My dog also was much happier when I showed less worry and was not upset. Dogs are very sensitive to our emotions and your dog is absolutely noticing that you’re upset, in turn making your dog either anxious or upset themselves. This isn’t good for their health. So if you won’t seek help for you, do so because you want your pup to be around as long as possible.