You can't :)
Edit: You could use a different genitive construction here if you wanted to make it more clear:
Ägaren till hunden har försvunnit = The owner of the dog has disappeared.
Ägarna till hunden har försvunnit = The owners of the dog have disappeared.
For whatever reason, I am having difficulty memorizing verbs that begin with för-. It just occurred to me that perhaps these verbs are compound verbs or verbs created by verb-ifing (I know this is not a word) other words. Can someone please comment on this thought? Thank you.
Yes :) It's a compound verb I believe. It has been borrowed from Low German 'vor-' but ultimately it seems to come from Proto-Germanic for 'before' or 'in front of'. If you search for a Swedish verb which begins with 'för-' on wiktionary you can see the word etymology e.g. https://en.wiktionary.org/wiki/försvinna
There is also a page with Swedish words which use 'för-' as a prefix - https://en.wiktionary.org/wiki/Category:Swedish_words_prefixed_with_för-
Thank you, loukaki! I had not found this wiki page before. This helps a lot.
I put "The dog owner has disappeared". Would this mean or translate differently than the original sentence? Thanks