Why wont my sims 3 pets Expansion pack work on my mac computer?

I recently bought the sims 3 pets expansion pack and when i put the disk into my mac, it wont work it just rejects it and puts it back out. i continue to try the same thing and now the disk is scratched from the mac computer. My mac is version 10.6.8 what do i do? please help D:

Report as