We're not sure. Pretty old. She's the one that is on pain meds. She was having seizures for a while. We have her on a couple of different meds. Seems we have most pain under control. Still, she has bad days. She'll just be laying beside me and all of a sudden yelp out loud and jump down. Cloudy eyes. Losing hearing.you have 3 right? How old is the shihtzu?