My puppy is suddenly becoming aggressive to my other dog

I rescued a 6 month old husky / lab / Sheppard mix 5 months ago. He turns 1 year next month, is fixed and used to be mostly a really good dog. I have a 6 year old husky who is an angel and is also fixed (female).

I’ve read a lot about the adolescence phase, but I don’t know if that’s what this is. When we first got our pup, he was resource guarding food and toys. We immediately started working with a trainer, and do our best to ensure no food or toys are out with them together.

He has become aggressive to other dogs by humping and just going crazy growling, so we can’t take him to the park anymore whereas before he was so good with every single dog. He snaps at my older dog all the time, he doesn’t play gently anymore and just is reverting in all aspects with the training we’ve done.

The trainer we hired is supposed to be one of the best, but she only provides us “preventative” training, but it isn’t working and we need help on what to actually do when our pup starts trying to play with the older dog but gets too rough, or why he is snapping through his crate now where he never did that before. We’ve tried so much but I don’t know what to do anymore. It’s as if every single day, some new bad behaviour comes up. We can’t even take him to public places to continue getting socialization as he is just so reactive and hyper and crazy around everything now.

I don’t want him to keep these bad habits and I know this age is imperative to ensure we train these things out of him but I feel like we’ve tried so many things but he just keeps getting worse. He’s such a sweet dog and has never been aggressive to me, but he’s torturing my older dog and we just want them to get along like how they used to.

Please help, I’m so exhausted and the trainer I paid for isn’t helping and we don’t know what to do anymore.

submitted by /u/Electrical_Pattern19
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