I use a grid... it's homemade, but it's like the WizDog and UGODog, there are some mixed feelings on these products, as they are expensive, but a homemade system isn't it costs $20 tops There is a thread on here talking about them that I explained some of the pros and cons. I think it was called WizDog or UGODog.
Good luck!
__________________ Kendra Harley, you were the light in my life, rest peacefully my love! |