I doubt the rawhides have anything to do with the UTI, but they should be avoided in a dog with chronic
pancreatitis due to the fat content. Definitely check with your vet on that question.
Dogs, like humans, need a certain amount of fat for good nutrition, but sudden spikes in fat can bring on an acute case of pancreatitis - particularly in a dog who has already had it. Chronic pancreatitis is darned difficult to manage in humans as well as dogs.