What are safe training treats for my dog with a sensitive stomach?

Hello there! I'm sorry to hear about Ziggy's bout of diarrhea. Bits of apple used as training treats is usually fine for dogs, but an entire apple could potentially cause diarrhea as it is high in fiber and water. If he enjoys bits of carrot, then that is probably a fine treat for training. Green beans, bits of turkey hot dog, and small pieces of commercial dog treats are great for training as well. The key is that the training reward is small enough to be eaten in one bite. If they spend more than 1 or 2 seconds chewing and swallowing the treat, it's too big. You want your dog's focus to be on you during training time, so keep the treat small enough that his attention is not taken from you for more than a second a so. When giving treats for non-training times, they can be larger, but since they generally eat a bunch of treats during training, keeping them tiny can prevent an upset stomach. I hope that Ziggy remains healthy and that your training goes well! :)