Answer:

on the first occasion Bruno drank poison which was kept in the library for killing rat and mice. He was paralysed and was not able to walk properly.He dragged himself on his stumps. He breathed too heavily with heavy flanks. He was immediately taken to veterinarian hospital and was injected with 10CC of antidote

On the 2nd occasion he drank lots of engine oil kept for parasites but it had no ill effects on him ever.

Explanation:

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When Bruno ate poison [Barium Carbonate] he was paralysed , became critically ill, so taken to the vet and saved.

When he drank engine oil, it had no ill effect on him.