Some dogs are attracted to mothballs and will
try to play with them or eat them. How toxic mothballs are depends
on how many are eaten and how big and healthy your dog is. They
contain either naphthalene or paradichlorobenzene, which in
high doses can cause hemolytic anemia or convulsions. Don't
put mothballs in areas where your dog might be able to get to
them, such as on the floors of closets. Call your vet if your
dog has gotten into a box of mothballs.