Watashi wa = neutral polite first-person pronoun, marked as sentence topic ("as for me") harinezumi no = "hedgehog," marked as subject of a relative clause iru koto ga = "to exist" for animate subjects, nominalized, marked as subject of main clause ("existing") arimasen = "to exist" for inanimate subjects, negative polite form ("is not")
Watashi wa harinezumi no fuzai ga arimasu (note correction)
Watashi wa = same start ("as for me") harinezumi no = hedgehog, marked as genitive case ("the hedgehog's") fuzai = "absence," marked as subject arimasu = "exists" for inanimate subjects, positive polite form ("is")
The more natural way of saying "I don't have a hedgehog" would be "Watashi wa harinezumi wa imasen" (As for me, hedgehogs don't exist, the topic indicating that it's talking about a localized existence).
no subject
Watashi wa = neutral polite first-person pronoun, marked as sentence topic ("as for me")
harinezumi no = "hedgehog," marked as subject of a relative clause
iru koto ga = "to exist" for animate subjects, nominalized, marked as subject of main clause ("existing")
arimasen = "to exist" for inanimate subjects, negative polite form ("is not")
Watashi wa harinezumi no fuzai ga arimasu (note correction)
Watashi wa = same start ("as for me")
harinezumi no = hedgehog, marked as genitive case ("the hedgehog's")
fuzai = "absence," marked as subject
arimasu = "exists" for inanimate subjects, positive polite form ("is")
The more natural way of saying "I don't have a hedgehog" would be "Watashi wa harinezumi wa imasen" (As for me, hedgehogs don't exist, the topic indicating that it's talking about a localized existence).
---L.