Many problems arise when the dog is bored and good toys can stop them from becoming bored. Some toys might seem expensive, however a good toy will be durable and will seem cheap next to a chewed couch!
I look for a solid toy especially if you have a chewer. I prefer rubber toys because if a piece is chewed off it passses through the dogs gut more easily than plastic or string.
Stuff food into the toy to make it more interesting for the dog. I try to make it as difficult as possible to challenge the dog and keep them busy.
Bounce adds a lot more fun for the dog and can be used in the park if they like to chase things.
Squeaky toys are great for some dogs but others will destroy them in seconds (including our dog Mildred).