Study finds anxiety in dogs is a much bigger problem than previously realised
Prof Loki and his team at Helsinki vet School conducted an on line survey of the guardians of 13700 dogs and nearly 3/4 suffered from anxiety - aggression, fear of noise (32%), separation anxiety
See Vet Times 17/03/2020
Salonen M et al Prevalence, comorbidity and breed differences in canine anxiety Sci Rep 10 2963
Now this is a complex subject and there are many factors, as you will see if you read more, involved including breed type and early weaning. Treatments include various training and desensitisation techniques but you will find CBD oil can help a lot.