Roommate might be abusing her service dog, unsure how to address it.
(Using different names) My roommate Delilah and I (both 20 F) are concerned that our other roommate Briana (also 20 F) might be abusing her service dog. We are not the most knowledgeable on service dog trainings but a lot of Briana’s actions toward the dog seem cruel. Delilah also has a friend with a service dog with similar tasks/training and the friend does not act like this with their dog. We do not know how to bring this up to her, because Briana is heavily autistic and feels emotions very deeply. We do not want to upset her, but we feel uncomfortable because it seems abusive. She constantly yells at him over the littlest things, and Delilah, who has a dog herself, is concerned because you can see his ribs through his skin, and apparently Briana only feeds him once a day. He's a fairly large dog (yellow lab) and we don't know if one bowl of food a day is enough. Also the other day, I saw her smack his nose and it was HARD. I have also seen her push/shove the dog in a way i’d consider more forceful than necessary. You could hear the contact of it. We do not know what to do, as we know Briana isn't a malicious person and don't want to hurt her feelings. We don't think she is aware she's abusing him, and dont know how to bring it up because she CLEARLY loves the dog, but it doesn’t sit right with us how she treats him. Any advice is appreciated, thank you!
edit:
Thank you everyone for your advice! The conclusion me and my roommate has come to is to talk to her this week (my roommate is currently home for the weekend). My friend who owns a service dog and me also had a chat about this since she knows both my roommate and her dog passively. My friend has helped me a lot as well as all of you! We figured out together what program my Briana got her dog from and have contacted them, with hopes to get her some refreshers on training. From what me and my friend can tell based on knowing her, It seems she hasn’t been properly keeping up with his training leading him to act out/misbeheave and causing her to get overwhelmed and frustrated at the dog. During our talk I will be sure to mention all of our concerns to her and will try to make sure she improves. The dog is also close to retirement so I might talk to her about that possibility being a solution to her growing frustrations with him. Thank you all for your support and advice! I will do my best to make sure the dog is well taken care of and loved while we are roommates and for the rest of his life :)