2-year-old male German Shepherd with severe skin disease, weight loss, fleas/ticks, and chronic itching – rescue dog

Species: Dog
Age: ~2 years
Sex/Neuter status: Male, intact
Breed: German Shepherd Dog
Body weight: ~25 kg (estimate)
History: Rescue dog, outdoor environment with goats present
Clinical signs:
Severe chronic itching
Heavy dandruff/scaling over much of the body
Hair loss on ears, neck, elbows/joints, rump, and tail base
Thickened, darkened, wrinkled (“elephant skin”) areas around the muzzle and neck
Fleas present
Ticks present
Progressive weight loss
Mild depression/lethargy but still ambulatory
Appetite slightly reduced but still eating
Timeline:
Elbow/joint lesions started several months ago.
Neck lesions developed about 1–2 months ago.
Ear involvement is more recent (days to weeks).
Skin disease appears to be spreading.
Previous history:
About 2 months ago the dog became very weak, stopped eating/drinking, and had very pale gums/tongue. We suspected a tick-borne disease (possibly Babesia) but no testing was performed. The dog improved on his own but has since started losing weight again.