I have no clear idea about 'cavernicola negro de caricatura'. It might be a term from a niche or regional form of cartooning. Without more context or specific information, it's hard to say exactly what it means.
Often, cartoon white students are shown as being friendly and sociable. They might be passionate about learning and participating in various activities at school. Also, their appearance could include typical school uniforms or casual clothing.
Treating dogs with mange can be done in several ways. A vet visit is a must. They may suggest using anti-parasitic medications and keeping your dog isolated to prevent the mange from spreading. Regular grooming and keeping the environment clean help too.
It could be a fun and imaginative scene. Maybe the cartoon man has a big smile on his face as he holds the Lego pieces, ready to build something creative.