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Okay so this is like the first time I'm posting on here and I'm not sure if there's a specific thread I should post in but I was hoping I could get some help here
Basically, me and my family own a dog, about 4 years old, chihuahua mix. He's not super well trained but he listens and understands pretty much what you want and such
He's always been sleeping in our beds, and doesn't mind if you pick him up, hold him in your arms or in your lap or whatever, he enjoys it, even if he's on his back
Lately though he's been acting strange from time to time
It started like a little over half a year ago, he started growling sometimes at my little sister. She's pretty loud and clumsy and sometimes not very careful with him, also since she's the youngest, we just assumed he was kinda trying to get a little higher in rank sort of
But just pretty recently he's started growling at me and sometimes my partner (who visits pretty often) who he completely adores.
It only happens if he's like lying down and you lean forward to give him like a kiss, and then he gets super worked up
I've tried everything I can think of, ignoring, comforting, telling him of by keeping him at his back and waiting for him to calm down (this only makes it worse) and nothing works
The weirdest part is that he seems so regretful of it, like right after you lean back he licks you in the face and walks after you to "apologize"
Just today it got really bad and he went from growling to snarling and it even felt like he was gonna bite, something he has never done
I've grown up with dogs, learnt a lot from my grandmother who's worked with dogs most her life, read tons of books and watches documentaries etc, and I have no idea what this behavior is
I'm terrified that he might have a tumor or something
I'll call the vet tomorrow and talk to them, but I just wanted to ask here to see if anyone knew what this might be
Pic related, doggie on the right