Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Good Concept - needs improvement

In concept it is a good idea but in practice there is some work needed. Neither my husbands nor I have been able to open it to clean and as such I stopped using it. I also believe that this is not a toy for big dogs inside the house. Dogs really enjoy it, yes; however the hard plastic is extremely loud, slides on hardwood floors and gets caught under furniture and dog just plows through it to get to it.Update: Took the cube to the pet store and they were unable to open it as well. As a matter of fact we did try 3 other cubes in stock and were able to open only 1 of them. A better option in my opinion is the Omega Paw Tricky Treat Ball.