My hamster is covered in bugs, big ones bleed when squeezed, small ones don’t – what medicine?

From your description, the hamster is likely infected with external parasites such as ticks or fleas. Isolate the infected hamster to prevent contact with other animals and reduce spread.

Treat it with a pet external-parasite medication containing praziquantel or albendazole, but control the method and dose carefully – a small amount is enough – to avoid harming the hamster.