I'm not sure what you mean by fat pocket. Do you mean like a fat pad? Or your vet isn't certain whether your pup has a fat pad or an inguinal hernia? Or do you mean something like a fatty tumor? In most cases none of those would be an emergency. Might want to make sure a fatty tumor is a fatty tumor with some testing and take it from there. Inguinal hernia can be monitored if small and no important internal parts looping through to be closed off and repaired at the same time of spay or neuter sometimes or may need to be repaired fairly soon depending. What does your vet say about it? How old is your pup and general health and breed?