chihuahua eating habits?

my female chihuahua hasn't been wanting to eat. she ate kibbles and bits for a year, she just turned a year old i switched to iams, not too interested and back to kibbles and bits i occasionally give her wet food too she is still pooping sometimes wet sometimes dry and sometimes throw up i know she is little and has a small tummy that may be sensitive is this normal? any suggestions?
 
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