Final answer:
The puppy may have a skin disorder such as a parasitic infestation or infection which requires evaluation by a veterinarian. In humans, similar symptoms can indicate dermatological conditions.
Step-by-step explanation:
A puppy presenting with patches of hair loss, itching, dry and wrinkled skin, and crusty sores may be exhibiting signs of a skin disorder that could be due to various causes including parasitic infestations, allergies, or even skin infections.
These symptoms need to be assessed by a veterinarian for proper diagnosis and treatment. In humans, similar symptoms such as itchy or sore patches of thick, red skin with silvery scales.
Commonly indicate conditions like psoriasis, especially when these patches affect areas like elbows and knees.Other symptoms such as cracks or sores on the outer surface of the lips (cheliosis).
Inflammation and redness of the tongue, and moist, scaly skin inflammation (seborrheic dermatitis) may suggest deficiencies or dermatological conditions that require medical attention.
For instance, ringworm, a fungal infection, presents as a red circular spot with a raised red edge and is confirmed with a Wood's lamp examination.
However, when associated with a history of an animal bite, as in the case of David, and accompanied by weakness, fever, headache, and agitation, the symptoms might be indicative of more serious diseases like rabies, necessitating immediate clinical assessment.