A dog's size significantly influences safe toy choices because toys that are too small can be a choking hazard for larger breeds, while toys designed for bigger dogs can be too hard or large for smaller breeds, risking dental damage or injury. Ensuring toys are appropriately sized for your dog prevents these risks, facilitating safer play. For growing puppies, it's important to update their toys as they grow to maintain suitable toy size, keeping playtime both fun and safe. Always match the toy's size and durability with your dog's size and chewing habits.