It’s nice to give your pet a treat and there are plenty of specially prepared chews and treats on the market. It’s always a good idea to build treat-giving into a training regime. Even small pets will respond to rewards, given consistently when they repeat good behaviour. Coming to hand, or being quietly and supportively lifted out of their hutch or cage, for instance. The main point is to check the treat is nutritionally healthy. You can find this through the RDA panel showing what it contributes to the daily diet.