a dehumidifier might help. But I really think you have a mold PROBLEM. Be glad it's a rental & that you didn't buy this place. ... View related article.
Don't remember what they cost, but Home Depot & Lowe's have a thingy made for this purpose. Even has a brush attached so you can unscrew it, do the touchup & put the cover back on. ... View related article.
Bred, raised & showed German Shepherds for many years...and that looks like a very nice Shep to me. 60 lbs. is about right for his age. And he is in a classic 'show stance'. Nice-looking dog. ... View related article.
