Are barrel cactus different from cholla?? Yes...the nickname for the cholla is “jumping cactus” because of the way those spiny clusters so easily detach from the plant and attach to you or your pets.
My MIl's little dog got tangled with one when they were at a rest stop on their way to visit us a few months ago. Luckily, as in this story, there were some helpful people around to help her out.
People that have cats or other small animals that live in coyote country are fools for letting them run around outside. In Arizona, coyotes were here long before us and they have an important niche in keeping down the population of critters even more undesirable than themselves.