i'm a new yorkie owner so I can't give you advice on the food but mine weighs 4lbs at 3 months already and he still only eats about 1/4 cup a day. I give him treats throughout the day when he goes on his potty pad so that adds up.
I am here to tell you that you're not neurotic. I worry about my baby all the time and took him to the vet hospital today b/c i thought he had an overdose of frontline. the vets there thought i was crazy and told me he is perfectly fine.
you're a concerned mother and I am a little suprised they still didn't do blood work just to be safe.
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