"Ο σκύλος μου ήταν άρρωστος χθες."

Translation: My dog was sick yesterday.

[Jon345104]

Is Χτες the same as Χθες

[G.Georgopoulos]

Yes, it is ;)

[alainPierrot]

does άρρωστος mean both sick and ill?

[Lng52-._]

Are the following obsolete: "χτες" and "εχθές"?

[UpDownStrange]

Does the double ρ change the pronunciation at all?

[D_..]

No, it doesn't.