Well obviously we all love owning dogs and find it very rewarding sharing our homes - but in the spirit of this thread and talking about what I've found challenging here goes.
Zipper has destuffed a sofa and chewed a hole in the garden fence

, he's a 18lb Shih Tzu cross
Lilly wee's when left alone if she feels stressed and has ruined 2 carpets that we've had to replace

, she's a 9lb Maltese cross