Just finished running every difficulty. Here are the results of my drops:
LFR:
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No pets dropped in Terrace of Endless Spring
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Comet = Elegon (Mogu’shan Vaults)
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Spawn of Garalon = Garalon (Heart of Fear)
10 Normal:
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Azure Windseeker = Tsulong (Terrace of Endless Spring)
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Stoneclaw = Stone Guard (Mogu’shan Vaults)
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No pets dropped in Heart of Fear
10 Heroic:
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No pets dropped in Terrace of Endless Spring
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No pets dropped in Mogu’shan Vaults
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Kor’thik Swarmling = Imperial Vizier Zor’lok (Heart of Fear)
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Amberglow Stinger = Blade Lord Ta’yak (Heart of Fear)
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Spawn of Garalon = Garalon (Heart of Fear)
25 Normal:
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Azure Windseeker = Tsulong (Terrace of Endless Spring)
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Spirit of the Spring = Lei Shi (Terrace of Endless Spring)
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Wayward Spirit = Gara’jal the Spiritbinder (Mogu’shan Vaults)
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Amberglow Stinger = Blade Lord Ta’yak (Heart of Fear)
25 Heroic:
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No pets dropped in Terrace of Endless Spring
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Stoneclaw = Stone Guard (Mogu’shan Vaults)
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Comet = Elegon (Mogu’shan Vaults)
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Amberglow Stinger = Blade Lord Ta’yak (Heart of Fear)
I did not get any from doing bonus rolls, but honestly I wasn't rolling them every time.