Love them! We were at Petsmart the day before yesterday and bought a ton of toys, including some of these. They don't know whether they are Christmas toys or not, so we put them away for times when the toy box is low.
There is actually a pattern to sew a quick one on Pinterest. I made one from an old pair of denim jeans for Gunner! He LOVES it! http://www.squidoo.com/dog-bottle-toy-diy
i have never seen these!!!! looks awesome. ill have to try and get one for jovi. she destroys literally every toy i get her :[ its a shame and such a waste of money.