<human>: Give me a shortened version of the text

i'm not sure if this is the right place to post this but i am in desperate need of advice.

my wife and i have a little dog who is going to be 18 this year. recently, his health has gone way downhill. he is completely blind and is on 3 different medications - one for blood pressure, one for his thyroid and another nutritional supplement to stave off dimensia. he also occassionally has seizures and they dont know the cause without having to do expensive things like MRI, and he has a heart problem. i can't remember the name of the problem, it's something to do with irregular heartbeat.

because he is blind, he needs to be hand fed and guided to his water. it's quite difficult to get him to drink sometimes.

his sleeping schedule is completely off whack - it is like that of a baby. we are waking up many times at night to him whining for something, be it food, water, or the bathroom, or sometimes he just wants to be held.

the worst thing is that we cannot go anywhere or do anything now that he is like this. my wife wants to cancel a trip in july we have been planning on for over a year because it would be too expensive to board him and she doesn't want to leave him alone. we can barely even ever go out for a night on the town.

i think of how this could go on for at least a few more years and the thought alone drives me insane. is that selfish?

i love the dog as much as she does, but sometimes i think it might be better if he was put down. he is not suffering physically (as far as we know), but his quality of life has deteriorated greatly. but how can i possibly bring this up? is it even appropriate? keep in mind this dog has been with her since it was a small puppy. i have only known him for about 7 years.
<bot>: older dog's quality of life has greatly deteriorated, requires constant attention, wife wants to cancel trips and plans on his behalf, forcing us to stay home all the time to take care of him. not sure where to go from here.