So far the only toys that last more than a day at my house are the Kogs. Although, she can tear them into pieces whenever she wants. She just seems to really like the Kong so she keeps it around for awhile! lol Our other pit, who is only a year old, seems to like the soft fabric type toys instead of the tough plastic kongs, so we tried the Kong wubba and he LOVED it, but they are not as durable and he was able to break the ball out.
I am also in search of the most durable toy out there!!! Any ideas would be wonderful!