Thank you for reviewing this product! ALL WEIGHT RANGES. GlycoFlex® is a joint support supplement for dogs of any age and is clinically proven to increase hind leg strength by more than 40%. As the LDL cholesterol levels start to drop, this can help to further reduce the strain on your cat's. This powerful formula consists of amino acids, vitamins and minerals that support a normal heartbeat. Sign-up, Sign-in or Checkout as a Guest Parvovirus more commonly infects young puppies, 6 weeks to 6 months of age.