On two occasions Bruno ate/drank something that should not be eaten/drunk. What happened to him on these occasions?

Hint: The Bond of Love is about the emotional bond that exists between the author's wife and her pet bear. The author accidentally saved the young bear and gave it to his wife. Following that, they began to bond as if he were their child, and the author's wife adores him.

Complete answer:
The author of this storey rescued the newborn bear and brought him to Bangalore, where he was given to his wife. She was overjoyed to discover the small hairy critter and immediately wrapped a colourful ribbon around its neck, naming it ‘Bruno.' But after some time, Bruno had grown too big and was a danger to pets like cats and dogs, so the author decided to send it to the zoo. Bruno did not eat food and became thin because the author's wife was missing Bruno and Bruno was missing her.

On the first occasion, Bruno inadvertently ingested a toxin known as barium carbonate. He was unable to stand since he was paralysed. He was deteriorating fast. Bruno got up after thirty minutes and had a terrific feed after the vet shot him twice. He drank about a gallon of old engine oil in the following occurrence, but luckily he was unaffected.

Note: The lesson of Kenneth Anderson's novella "Bond of Love" is that humans may neglect or abuse wild creatures, yet animals have faith in humanity as well. Because of the author's wife's love and respect for the sloth bear, 'Bruno,' the bear is able to return to live with her once more.