What a pair of smashing boys! They really look settled and it's great to hear that you're enjoying them so much. Well done for taking on the pair, it's so lovely that they can be together.
On the joint supplement... I have done a lot of research into the various similiar supplements available for horses and found that one of the best that I found, is also suitable for dogs. Made by a small company based in Derbyshire called Holistic Horse Health
www.holistichorsehealth.com
There are 3 products available, 'Cartilage Care', 'MSM Super strength' and 'Glucosamine HCL' all suitable for dogs too. What seems to mark them out from a lot of the other products is that they don't use 'fillers' to bulk out the product. I was shocked to learn that most of the products on the market use a high percentage of either dextrose (sugar) or limestone flour, for no therapeutic reason, but simply to add bulk. As many of the supplements are quite costly, the more active ingredient they contain, the less you have to feed and the more cost effective they work out to be.
The woman who runs the company I found to be really helpful in providing information, so you might want to contact her and ask about which product she's recommend and what dosage for a dog. Her name's Lesley and her email and phone number are on her website.
I know I sound like I should be on a commission from them, but having trawled through umpteen options, I was recommended this company by a vet nurse friend and was pretty impressed. Have a look and see what you think.
Hope that this might help and keep the updates coming!
Karen & George
Thanks for giving the boys a lovely place to rest their paws. 
if not on the settee. 
I bet it smelled wonderful 
