Scott Smith wrote, and I excerpt:
"(Old tubulars make fun dog toys! They grab on and you can spin them around! I have six available for immediate sale! Delight your canines!)"
I did that once with one of my dogs, without properly cleaning the glue off the tire. The dog played along for a while, but quickly developed a (literal) distaste for sew-ups. The fun continues with poly-propylene rope & such, but..