Out of what you have listed there, I would do the Holistic Blend liquid. Looks like it has the best amount of glucosamine per dose, and it does have MSM. I wouldn't do the kelp. Kelp can depress thyroid function over time, so you don't want to give it daily, and he needs glucosamine daily if you're supplementing with it. Riddle is on
Connectin tablets. Our vet said that's as good as anything he has, and I love that it has the added herbs for pain, inflammation, etc. Plus turmeric is a tumor fighter.
I would like to do underwater treadmill with Riddle, but to be perfectly honest we can't afford it right now.
sad Thankfully she won't really do zoomies around the house, its cold so she just wants to cuddle under blankets. She has a hard time when we go out though, she's used to being off leash and it bugs her to be restricted.