If your dog doesn't immediately start playing with the toy you bought for them, don't worry. Dogs eventually will become more comfortable. One thing that you can do when faced with a stubborn pup is to try interacting with the toy yourself. This may be helpful in getting your dog to understand that it's okay to play with, and how to interact with it. You can also reward your dog with a treat whenever they interact with the toy. This encourages your dog to continue to show interest in the toy, and help your dog further realize that the toy is something to tug on. Getting involved in playtime is one of the best ways to bond with your dog and make them comfortable with new toys. If you'd like to learn more, here's an article that may be useful to you.