Signs of tension or mild stress in your dog:
A dog with short, tight lips is expressing tension or a low level of stress. Becker notes the importance to take heed thus avoiding the dog becoming aggressive or potentially dangerous. He says that, “In order to recognize when your dog is anxious, it is important to be familiar with how he behaves when he’s relaxed” (How to Tell If Your Dog Is Anxious or Stressed). If there is no visible cause for the stress in your vicinity it may be the result of an ailment (Clarke, 2017). The tight mouth is accompanied by other changes in the dog’s posture including: the ears moving partially backwards; a slight narrowing of the eyes; a tense body, possibly lowered into a submissive position; a partial lowering of the tail; accompanied by a low whine. The dog may try to appease the other dog or display displacement or avoidance behaviour. Some of this is to alleviate the stress (eg yawning, tongue flicking or having a curved tongue (Stilwell, n.d.) and some is to move itself away (eg turning the he...