Gus is very constipated, he has been on Lactulose for awhile now but due to the chemo drugs he's receiving his constipation is increasing,it's been many days since his last "movement" What else can I give him besides the lactulose? He won't touch pumpkin with a 10 foot paw. The chemo has had remarkable results otherwise, only one treatment so far but he looks and acts so much better than a week ago, I've got my cat back.