Please choose the correct ending to complete the given sentence: Pets and Animals: [header] How to know if a kitten is stressed [title] Notice any digestive problems. [step] Stress and anxiety in a kitten can lead to digestive issues. Diarrhea and constipation are common reactions to stress.

Ending1: This can lead to a kitten having low bowel function, intestinal symptoms or problems with the digestive system. [substeps] If you notice any diarrhea or constipation, take your kitten to the vet. Ending2: If your kitten has a diarrhea and constipation and you think she might be stressed, take her to the vet. [substeps] Your kitten might seem sick and she might vomit when she eats or she might not have food in her mouth. Ending3: The kitten will also be calmer, more energetic, and more relaxed when she has something to eat. [substeps] In particular, if she is bitten and has a persistent inflammation of the mouth, this could be a sign of stress. Ending4: As you clean out the litter box, notice any abnormalities or changes in their habits. [substeps] They may also start defecating outside of the litter box.

Answer format: ending1/ending2/ending3/ending4