Svetlana Batukova, 46, is in police custody after she was found next to the bloody corpse of her husband named locally as Horst Hans Henkels on Friday.
A post mortem on Saturday revealed that the German had bled to death after being repeatedly stabbed with a kitchen knife.
Flesh from his arms had reportedly been cut off and fed to the couple's dog, an American Staffordshire bull terrior, according to the online Periodistadigital.
Initial findings widely reported in local media on the Balearic Islands indicated that the victim had been drugged before being repeatedly stabbed and had bled to death on the floor of their flat in Sant Llorenç.
The couple had reportedly married in January and Henkels had recently undergone surgery on his trachea and could therefore hardly speak.
Local police confirmed that they had been called out several times to the property in recent months over domestic rows.
Batukova, who was reportedly under the influence of alcohol and drugs when arrested, is due to appear before an investigating magistrate on Monday.