A couple of days ago my Guinea Pig, began spontaneously wheeking in pain and seemed constipated. We took him to the vet and the vet said nothing was obviously wrong with him after a check up, she injected him with a Prebiotic and since then he has been better but his stomach occasionally rumbles and he looks slightly uncomfortable. Upon the vet's advice and personal experience we are avoiding 'heavy' foods with him such as cucumbers and instead giving him more leafy greens like spinach and extra access to hay. Are there any other suggestions as in which foods I should feed him plentiful of and should I buy him digestive tablets? Thanks.