Who can put a number on what "enough" is? When you're willing to open your heart to a greyhound and love them fully through all their ages, it is still profoundly painful to lose them, no matter how old they live to be. In June, I offerred to foster little Shari who had bounced from homes twice, no fault of hers, and immediately fell in love with her. She became permanent within a couple of weeks. She'll be 13 in Feb., and has been such an incredible source of joy (still plays with stuffies and pounces on bonies), deep love , and companionship. She's my one grey that is NOT a bed hog! I help her up on the bed, she cuddles in and is quiet all night. Every day with her is special, and I truly cherish all of my greys more because of her From my experience with her, I would gladly take in many more senior greys.