If your baby is developing a sensitive stomach, it could be her regular kibble, the chicken, the pineapple-topped yogurt or the onion. My late Jilly - and now my Tibbe once he got a sensitive stomach beginning at age 3 1/2 - neither could/can eat plain or fancy yogurt, pineapple-topped or not, pineapple by itself, boiled chicken or, of course, onion, because it did/does make them sick and have soft stools/diarrhea. With Jilly it was pure diarrhea, often with blood and it wouldn't stop for days, despite all the vetting/Rx's. They kept having me feed her boiled chicken and it turns out, she couldn't digest real meat of any kind, or even canned dog food of any kind. Tibbe can't eat real meat either. Dogs beginning to develop sensitive stomachs begin to have problems like this from almost anything, including their regular dog food, and you have to use trial and error to find out what kind of stomach-friendly food they can eat, even in dry kibble sometimes.
The onion could be the cause due to stomach sensitivity to digesting it so hopefully that is what caused the symptoms though I understand the actual onion toxicity is at the red blood cell level, causing it to lyse or explode if the onion is even in small to moderate amounts and causing lethargy, dizziness, light-headedness though a large ingestion of onion can cause GI problems as well as a host of other very serious problems.
If this keeps happening, ask the vet and see about putting her on a prescription food or other easily digested dog food and see if it stops.
__________________  Jeanie and Tibbe One must do the best one can. You may get some marks for a very imperfect answer: you will certainly get none for leaving the question alone. C. S. Lewis |