Can I Do Anything About My Roommate's Homeless Mom Selling The Stray Puppy I Was Taking Care Of Behind My Back?

On the 15th of March my roommate and I came back from an overnight stay at my step brother's house the next town over, her mom was staying in the apartment looking after her cat while we were gone. We get home and there's a 2 month old puppy cowering in the corner. She had given her a bath but otherwise just left her there. I ran out and bought puppy pads, food, a soft toy, a chew toy, treats, and a collar for walking. Already owned a leash and large kennel.

I got back and she hadn't moved, clearly traumatized by being abandoned on the road and brought to an unfamiliar apartment. I couldn't get her to eat or drink yet so I brought her to my room, laid her in my bed, got her good and cozy, and laid next to her. She slept most of the rest of the day, got her to eat and drink water. She peed a little on my bedding and I wanted her to get used to sleeping in the living room, where the kennel is, so I slept that night on the couch with my arm slung over the side, comforting her on the floor next to me.

I had to stay with her constantly, she was very scared and didn't want to be left alone. She followed me from room to room and cried when she couldn't see me. The next night I put her to sleep in the kennel, she cried for a bit but eventually fell asleep with me next to her. I went to bed and woke up around 11 to her crying at my door, roommate's mom (we'll call her T) had let her out of the kennel because when she got up and started being active in the living room the puppy woke up and started crying for attention. T let her out then sat on the couch and mostly ignored her, this is a habit I've seen for her with dogs, where she readily puts herself in a situation of being responsible for them, even asking to take care of them, then ignores them until someone else takes over. I had to leave to pick up my car from the shop, I comforted the puppy as much as I could then ran out to catch my ride. I explained to T before I left how I was gonna buy carpet cleaner and disassemble and reassemble the kennel in my room so she could be soothed by my presence until she was kennel broken. I wanna reiterate, 2 months old, still got all her baby teeth, is gonna cry occasionally when alone. It's a little inconvenient now but it's not much worse than roommate's cat, who often cries at night. And I was paying for it, I was dealing with it. My roommate lost her job, I've been paying utilities for months, and the full rent last month. And I let T stay with us for free whenever she wanted. I'm saying all this because I feel like my stake in the home, and in the dog's care, entitles me to some communication.

An hour or so after I had left T starts messaging me. Saying she found someone to take the puppy. I tell her let's take it slow, I've still got it under control, nothing's been damaged and it's only been 2 days, I'll get it sorted. I wanna decide the best course of action and if rehoming is the move i wanna vet the people first. Then she tells me she already gave them the dog.

I'm furious, I'm shocked, I was not asked or told or even allowed to say goodbye, the second she realizes I'm mad at her she goes silent. I call my roommate who went on a walk and fell asleep sitting by a pool, tell her she needs to talk to her mom and find out what's going on. I race home and no one's there. They're both gone and the puppy is gone. T ran away cuz I was pissed and roommate went with her cuz she didn't know what else to do. I've messaged with her a fair bit. She doesn't know where the dog was left and doesn't seem to be able to get it out of T, and while she's understanding of my rage she's reluctant to take sides. I'm deeply suspicious, T denies it completely but she specifically waited till we were both out of the way, didn't tell anyone, and only after the exchange did she say anything. I believe she 100% sold that dog. I don't wanna seem judgemental of homeless people or people with a history of drug use, but T is a lifelong hardcore drug addict who's been living in a tent for a long time. She's asked me for money before, I've given it, and I have very good reason to believe she's stolen from me in the past. I love my roommate and don't wanna fight with her but she can't believe her mom would do anything like that, and I can't believe T should be free from suspicion after everything.

This all just happened a few hours ago and I'm still reeling, I'm heartbroken, I feel used and disrespected, I just wanna know what happened to the dog. I wanna know where she is. I had a right to be included in this decision, or at the very least given the chance to say goodbye. I'm still shaking.

Location: AZ, US