Dog behavior is not good

I adopted my dog November 2019. They told me she was around 4 years old. So now she would be about 9 if their records are correct. Well, we been having a bit of an issue with her. She always seems to be hungry then will drink a ton of water. Our roommate has a dog normally they play get along well I went out to throw something away and seen the other dog so I petted her and told her let’s go get beauty. So we did and once I let her out she attacked the other dog had her pinned on the ground. It took me yelling, swearing and looking like some crazy woman outside lol I finally got my dog to stop. So I took her in the house and made sure the other dog was okay. My dog beauty is a pit bull/black lab. She’s very jealous. When I’m playing with my son she’s always coming after me, not aggressively but like being in the middle. She does the same thing with my boyfriend when I cuddle with him, she will get her way in. It’s like she doesn’t want me close to my boyfriend or child. It’s kinda got me upset because I’m not sure what’s going to happen next. I did read online that dogs get pain and that can cause them to snap too. She acts like a puppy so I’m not sure what to even do if she continues this behavior. Also she won’t do anything without getting a treat. It’s actually pretty ridiculous. Sorry for the rant but if you have any advice I’d appreciate it a bunch

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I've been in similar situations but towards food aggression and the closet thing I had was a sack of potatoes🫣 because words and tone were not enough. More exercise will help in some situations, to get rid of excess energy and to instill closeness

With the excessive drinking and eating, I'd go to a ve45-6terinarian and have them do a superchem and a T4 test. If dogs are sick or excessively hungry, this can make them act out.

@Katie there’s a lot of things to consider when a dog bites a human. Not saying she bit anyone. My ex husband had a rottie and he bit people for absolutely no reason. Maybe it was based on his instincts but like he was way wrong. He bit a random woman at the park like she passed us and he knocked my ex to the ground to go bite her leg. Sorry I went on a tangent. I just don’t want my dog to be like this. Also, she hated me when I was pregnant but now she sometimes follows me around and my son is 2.5 yr old. She always takes his food! I’ve been telling her not to do that since he has started eating while playing. Idk I don’t want to take any chances on her biting us. I feel like I have to watch my back more. I seen her pin another dog down like she could’ve killed that dog.

Ill just piggy back a previous comment, she should get an exam and a senior panel of bloodwork done. Increased hunger and thirst are usually indicative of disease, which can coincide with behavioral issues. Schedule an appointment with her vet.