Phred here ~
Yep, Smokey started taking Glucosamine at about 2 years of age for his "trick knee" ...
and after about 6 months has hardly had a problem with it
"popping out".
Bowser started on Glucosamine at 10-12 years of age - as soon as he got here ...
He walked with a rear end "hop" step ... after about 6 months he was able to
walk with a more normal gait.
We use what Doc Mike (the FurKids' White Coat) takes for his OWN sore knees ...
WalMart store brand "Spring Valley" - Glucosamine Sulfate, 1000 mg capsules,
one per day.
(Smokey weighs ~~ 42#; Bowser about 30#)
And now *I* take one every morning, too! Dunno if it helps or not - but the old knees
don't bother me! 
Research I did, and Doc Mike agreed with, said combination Glucosamine and
Chondroitin hadn't been proven to be any better for DOGS than plain Glucosamine. There are now some newer supplements out that add "MSM" and offer
a THREE-way combination - Glucosamine + Chondroitin + MSM ...
but no real studies hve been done to prove the stuff "works".
Note: Smokey started out taking TWO x 500 mg TABLETS made by Spring Valley -
but our local WallyMart stopped carrying that in favor of the more popular larger CAPSULE.
Cost is only $10-$12 per 200 count bottle. Some of the VET-sold brands cost a LOT more -
and are of no better quality according to Doc Mike.
Smoke takes his by the "Open Wide & Shove it down" method;
Bowser has stopped *grabbing* (pills AND fingers) and now *EATS* his like a treat! 
(Capsule makes a loud
POP if he <chomps> it just right!) 
/s/ Phred
/s/ Cinder, Smokey & Heidi
R.I.P. ~ Boots, Bowser, Sherman, & Snoopy
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