Dogs with systemic inflammatory response syndrome have a multifactorial type of shock. It is classified primarily as maldistributive shock because inappropriate vasodilation is the most important mechanism. They also can have varying degrees of hypovolaemia and reduced cardiac function.How they look on PE depends upon their intravascular volume status. When they still have an adequate blood volume then they look hyperdynamic. The heart rates and contractility increase to counteract the vasodilation. The vasodilation gives them redder than normal MMs and the compensatory increase in cardiac output gives the a fast CRT and tall, narrow pulses. This dog has septic peritonitis and MMs don’t get much redder than this!