The squeeze button on the paw of a toy doesn't work

I need to know where to buy a new squeeze button to put in the paw of my grandson's animated toy, and how to solder it to the wire running down the arm. He has cerebral palsy and breaks all the buttons after squeezing them a lot. They don't last very long. it would be great if you would have some information or give me a source that might know. I have bought so many toys like this for him and he is so sad when they stop singing and dancing. Thank you for your time.