i have a labrador that is almost 15 years old and am starting to see simptomes that worry me

he has lost a lot of weight lately and has a hard time not pooping in middle of night- we get up to let him out in middle of night- he has increased problems with his back hips lately and its getting harder for him to get up, he is getting little growths around his eyes and has fatty deposits an his belly- we have gotten the growths and fatty deposits checked out but am worried that if we take him in for the other stuff that he will have to be put down and i do not know if i could handle that since i have had him since he was a pup

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