Bruno’s little spaniel managed to get into some nuts that he left out after watching a ballgame. Knowing that nuts are toxic to dogs, Bruno takes him in to see the vet. Checking the spaniel over, the vet tells Bruno that it looks as if the dog’s body is processing the toxin and should pass it naturally. His only fear is that as the toxin is excreted it may cause damage. The vet warns Bruno that they will have to keep a close watch on his dog for trouble in the future. What kind of trouble is the vet MOST likely worried about?