This question does not concern dogs and ought to be asked in the HEALTH section.
Depression in and of itself does not cause body aches, but things like fibromyalgia (which can have associated mental depression) Guillain Barre` syndrome, Covid and the flu can easily cause body pain. Low Vitamin D (from being inside and not getting enough sunlight can cause depression and cause chronic pain). https://www.webmd.com/pain-management/features/vit… vitamin B can lead to any number of neurological and physical problems, low mood and (fatigue) not to mention mental confusion, etc. https://www.medicalnewstoday.com/articles/324265#_… of these vitamin levels should be tested on any annual physical – but often ARE NOT, unless you request it and with your symptoms should be checked, IMO.