HELP! Dog has become aggressive toward me

Hey thank you for the reply! I plan to take him to the vet to have him checked out, he is due for a check-up anyhow.

I know that my parents never took him anywhere, and his only visitors would have been my grandma(s) for example. My brother and sister moved out of the house while I was gone. I don't think they tried to implement any new training, I think he became very protective over my small nephew since he didn't have me around and now my nephew and sister are out of the house. I will have to get more details on his life while I was gone to bring with to the vet.

I am not doing anything major because I don't want to stress him any extra, but I am taking him for walks and playing ball. I need to be the one who gives him his food as well I think. I have been slowly getting every piece of clothing I brought back with me into the wash so that they smell like here and less like Spain. Other than that I don't know what else I could try.

We have a yellow lab as well, and she is completely fine with me, but she is the family dog so she never got upset when I would leave. I always say hello to her first because she runs right up to me, but should I focus more on my doxie?

Thanks again.

Once he's cleared medically then time is going to be your friend in getting him to bond to you.

Start making every interaction with you a positive one, and try to limit doing anything that he'd view a unpleasant. So if he hates baths try having someone else be the one to give him one, or have a groomer do it for you. If you go the groomer route then take him somewhere fun first, then to the groomer, then somewhere else fun so that the does not view car rides with you as something horrid.

Be the one to feed him, train fun tricks, take him for walks and to fun places like the park, play with him, etc.

As I said, it will take time. My friend raised Zody a Chi x Dach, two breeds known for being one person dogs, then gave him to me when he was just over a year old. Zody was perfectly willing to wait till snowed in south Texas in August, for her to come back to him. He treated me as a servant but little else. For her he lit up and was super happy, with me it was, oh, your home, whatever. I got him in March, he was still acting that way in October, just about the time I was ready to give up he finally decided to except me into his heart. It was worth the wait.

Hopefully your boy does not take as long to come around.