Yeah, there are many people on here that keep them. They are probably one of the most popular puffers (except for porcs...). Overall, they are one of the easiest saltwater fish to keep as long as they are provided with a large enough home and fed a good variety of frozen foods. Are you asking about any specific dog face puffer? Generally, any of the Arothon sp. are called dog face puffers, and they get rather large. As far as putting one with a niger trigger, normally they are fine, but as always you never know exactly how a trigger will react to another fish added.