Well, it works for me, just not for my greyhound, for whom I purchased this ramp.  He is scared of it (any ramp actually), and will step over it, around it, beside it...basically anywhere but ON the darn ramp!  However, my small terrier mix thinks this ramp is the greatest things since sliced bread -- she runs up and down it with glee, barking encouragement at the greyhound.  The conclusion is if your dog has a low centre of gravity, they will likely take to this ramp quickly and with little training or coaxing.  The ramp is a bit heavy, but that's because its construction is sturdy, and it does fold up easily for storage which is a bonus.