We have two fur children. One is 2 the other is 1 and they have always been great dogs. Our 1 year old is a beagle/American bulldog. He's never really been destructive except for typical puppy problems when he first started to explore. He learns quick and is very sweet. Well, in the past few weeks he is destroying the walls in their room. He has always been fine in there before (and if you just want to judge that they have a room they are in please just keep it to yourself) we play with them and let them run a lot when we are home and we love both are dogs as if they were our children. I just didn't know if it could have to do with him sensing the baby's upcoming arrival.
Re: Puppy problems
Keep in mind that beagles are high-energy, high-strung, hounds that need stimulation and things to do. Keeping them confined to an area with room to explore is asking for disaster. Might I suggest a wire crate to keep him in while you're working with lots of toys? He would need slowly introduced since he isn't a puppy anymore. We keep our boxer crated while we're gone, but I've also had beagle and beagle mixes crated trained as well.
He also would likely benefit from long walks in different areas at least twice a day. He is a hound and loves exploring and smelling new things. He has lots of built up energy and the need to take care of hound-dog stuff. Maybe you can find a dog-walking service in your area or an older kid you can trust and pay them to walk the dogs?
ETA do you keep them in the room while you're not home or all the time? I'm not judging, just trying to be clear. If they're in there more than a few hours a day then they, especially the beagle mix, have loads of energy that needs released.
We use to keep him confined in a room when he was younger and he got in a lot of trouble (chewing base boards, peeing when he was potty trained, ext.). He just had way to much room to do what he wanted and he didn't have enough discipline because we weren't home so he thought we could do what he wanted but in his crate he knows the rules. It's smaller so he doesn't feel comfortable enough to pee, he has plenty of toys so he's inclined to play with them instead, he can't chew on metal bars, ext.
I definitely think dogs know the change though.
OP if you decide to crate train do not get a plastic one. I made that mistake with the first dog I trained, he was a beagle basset mix and chewed his way out when I left the house. I was gone for 29 minutes.
Ugh, so sorry you are going through this! Especially with a baby on the way! I'm a professional dog trainer and thought I'd chime in. Is he doing this while you are home, or when you are away?