New answers tagged mortar
Probably you let the dog in before enough days for concrete to get strong, or you did not water your concrete for at least 10 days.
The concrete shouldn't pop out... I'm guessing the mortar they used was no good. Just buy brickies mortar from the hardware or sand and cement Mortar is stronger as there is more cement to sand. mix with water and a squirt of bonding agent will make it even stronger (we use bondcrete). Mix until it's a moist workable putty. before filling the hole, break off ...
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