Just read your original post again - you may want to start feeding him his breakfast a bit earlier and tea a bit later as he is going quite a while from tea to breakfast and then when you switch to 2 meals they will be more evenly spread out ie 12 hours from breakfast to tea and 12 hrs from tea to breakfast.

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Proud owner of Rocky the Yorkie, born July 2008, who came to live with us at 8 weeks old