Definition: Given a real-life anecdote of a complex ethical situation, generate a suitable title that describes the main event/root cause of the situation. Imagine that the given text is a social media post, and you have to write the title of the post, so the users can decide to read the main text or not.
Input: My sister wants to get a second dog. My sister and I both still live with my mom, she's turning 20 soon and I'm 18. We have a few pets, namely a cat, dog and a few fish. The cat and dog are just kinda "the family's" but the fish are bought and kept by my sister.

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You have to understand where I am coming from. I love dogs and cats, but my dog is the light of my life. The one we currently have is called Marvin, and we've had him for six years. This dog is everything to me. I'm a huge introvert and due to having to move a lot of times throughout my childhood, hopping between schools and such I haven't got many friends. Most of my friends I only see online, and the only times I go outside are to go to the store and to walk my dog. So this dog has helped me through some rough times.

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Yesterday my sister and my mom were both downstairs. I went downstairs to grab a drink when my mom says something about how my sister was in a predicament. My mom wanted to hear what I had to say, but my sister seemed less eager to hear my thoughts. My mom told me that my sister was gonna get a second dog with her own money, and if I thought the dog looked cute. Now, I was kind of tired and generally speaking not thinking too hard so I simply shrugged and said "yeah it's pretty cool" and kept walking.

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It's only when I got back to my room and sat down that I actually thought about it. And then it hit me, I really don't think this is cool at all. 

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Now, we live in a duplex apartment. We aren't poor, we could probably sustain two dogs although it would cut things kind of tight. As for myself... I just can't. I hate the idea of another dog in the house. 

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It's mostly just the fact that I'll have to get to like this second dog, and I know I won't. My first dog, it clicked instantly. But a second dog? I just don't have room for that. And since I spend most of the day at home, and walk the dog most of the time, I just feel like I can't get myself to care. No matter how hard I try. 

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Worst case scenario: The two dogs hate each other. In which case we just brought an actual invader into our home. If the new dog is a piece of shit then I will probably grow to hate it, as I love my current dog too much. If the dog is actually nice and friendly, the two will become inseparable. This will basically mean that by default if I wanna spend more time with our current dog I better start liking this new dog too. Then there's also the fact that I doubt my sister can care for the dog properly. She barely cleans the fishtank enough times, let alone something as fragile as a dog in an apartment. Our cat won't like it either, and just in general the time and effort it'll take to get used to this new dog will just be too much. 

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When I told my sister I hated the idea of getting another dog in the house, we had a debate about it. She ended up calling me selfish and saying that I'm not the only one living in this house. She told me she had been planning this since 2018, and wasn't gonna give up on it now. This was my boiling point, and I didn't really wanna have a massive fight with my own family so I just gave up and continued with my day. The reason why this comment pissed me off so much is cause of how inconsiderate it feels. She's the one who wants to bring a new dog. She's the one who's forcing everyone else in the house to adapt. And she never decided to tell me anything about it. All just because she wants another dog.

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I don't even know why she wants another dog so badly, and I'm not about to ask as it'll probably lead nowhere. I really just don't know, am I being selfish? I hope this whole situation fits here.

not wanting my sister to get a second dog