We, the humans in this family, find these to be the best flying frisbees we've ever used.  Really really nice. They throw well and sail far.  Unfortunately, the smaller sized one is also our dog's favorite-in-the-whole-world frisbee, even though she has many different frisbees, especially dog specific ones.  But none even come close to the Aerobie in her opinion.  She LOVES it and goes bonkers every time it comes out in the yard.  She will chase it forever, until she literally drops.  We have to have a little pool for her to jump in often, because she gets so overheated. It is definitely not made to hold up to dog teeth, and so we cannot her alone with it for even a minute.  We play frisbee with her until WE are tired of throwing, and then we immediately put it away where she cannot get it.  Even so, we still have to replace hers every couple of months.  But she loves it SO much, we can't deprive her of one.