The title of that movie was chosen specifically to be a homophone for "I love dogs", so Siri's confusion is understandable. :)
"I helped Apple recognize speech" for those struggling.
† With “isle of”, I have two syllables and a velarised (“dark”) L in “isle”, a mid-central vowel (/ə/) in “of”; with “I love”, I have one syllable in “I”, a non-velarised (“light”) L and an open-mid back unrounded vowel (/ʌ/) in “love”.