What happens if a Teddy is not dewormed?

A Teddy without deworming may get various internal and external parasites like fleas, lice, mites, tapeworms, and coccidia, which steal nutrients and may spread to the owner by contact.

So generally deworm 2 to 6 month Teddies internally and externally every month; after 6 months, internally every 2 to 3 months, externally still monthly.