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I purchased the Theophylline 200 MG extended release for my Old English Sheepdog & my Shetland sheepdog, they both have hip issues. Since they have been on this, about 2 weeks, I have noticed a marked improvement on their ability to get up off the floor. They are able to play more & they want to play more. The Old English is 8 yrs old, but you wouldn't know it now that he's been on the Theophylline & the same for my Shetland, she is 6 yrs old. It's a great relief knowing that there's a product out their for my friends. Thanks OP