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This is a frustrating situation. I'm going to be honest here and say that paw pad lacerations are frustrating. The paw pad on the outer layers is keratinized skin - skin that is dead that has built up to provide the paw pad. When it is cut, it doesn't really heal. The living tissue below the cut on the paw pad is what heals. The cut keratinized tissue really doesn't again heal. Here 3 weeks out from the initial injury, I would hope that things are going better than they are. I would be concerned that an infection has started up in the cut. My best recommendation is to have your vet (or a second opinion with another vet) recheck it to see if there is an infection in the deeper tissues that needs oral antibiotics to treat it. As far as the tramadol, that is a decent pain medication but it sounds like he's still sore with it and I would consider an NSAID like Rimadyl to help give him some more relief. Here 3 weeks out, this injury isn't progressing as it should and it needs a second look at by your vet.