My dog Sampson is a 15 year old boxer/pittie mix(50 pounds). Has had diabetes for 7 years. Been on arthritis pain meds the last year.. Has become very sluggish the past 2-3 weeks. Vet diagnosed him with a early stage heart murmur and slight anemia. Changed his arthritis pain meds to Gabapentin. It made him so drowsy that he fell asleep while eating. Became unable to walk without assistance. We weaned him off the Gabapentin and back on the old pain meds. His walking has improved a little but still is wobbly. Yesterday he refused to eat, which is highly unusual for him. Still drinking, but not eating today. He sleeps a lot but also has 30-60 minute spells of restless/repetitive behavior. I’m thinking he may have dementia. Any suggestions on how to help him?