With 7 large Greyhounds of my own plus fostering new Greys from the track all the time, this house has a minimum of 10 Greys in it at all times. I own and foster only special needs Greyhounds (never a shortage of them),  mostly due to broken legs and hocks at the track. I make glucosamine a daily staple in their morning meals (with my Vet's approval of course), regardless of their ages. I've tried countless products, some they liked and some they turned their snouts up in rebellion. Even my 3 older ones who have about 7 teeth total among them like these. (For my toothless wonders, I crush them before adding to their  bowl-break into pieces in my hands then use a small 'smack and chop' chopper on the cutting board and scoop the small pieces into individual bowls). My other 4 who still have most of their teeth wait for me at the top of the cellar stairs while I'm filling their bowls and placing one of these peanut butter biscuits on the top of each. While 1-2 try to distract me as I'm hauling all these bowls up the stairs, the others bob and weave in attempts to steal the treats out of the bowls as I near the top of the steps. Have to admit defeat on occasion when I'm not paying attention :(