Yep look for a urine remover with enzymes to permanently remove smell. Most general cleaners such as vinegar and water or bleach etc only remove the water soluble components of urine (urea and urochrome) but leave behind the non-soluble uric acid crystals that retain the urine stain and strong urine odour. Any humidity or dampness will trigger the dormant crystals bringing back the urine smell. Most pet supply outlets sell these.
if your GSD is eating and eating and eating and losing weight - please consider testing for EPI.
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