A small number of countries — the UK, Ireland, Finland, Malta and Norway — require dogs to be treated for the tapeworm Echinococcus multilocularis shortly before entry, as part of an effort to keep the parasite out of their territory entirely. Sweden is not one of them.

This is worth flagging specifically because Sweden sits right next to one of the five: Jordbruksverket's own guidance on taking a pet out of Sweden confirms Norway requires deworming against the dwarf tapeworm, while saying nothing of the kind about entry into Sweden itself. The requirement runs in one direction only, and it's Norway's rule, not Sweden's.

If your route continues from Sweden into Norway, Finland, the UK, Ireland or Malta, plan the tapeworm treatment around that border, timed to whatever window the destination country sets — typically a day or so before arrival there. Coming the other way, into Sweden, there's nothing extra to arrange on this front.