"Please provide me with the different case forms of the word 'Собака' (Dog) in Russian, formatted as JSON. The output should look like this: 
{'Nominative': 'Example',
 'Genitive': 'Example',
 'Dative': 'Example',
 'Accusative': 'Example',
 'Instrumental': 'Example',
 'Prepositional': 'Example'}"