I've been struggling with our 20 month old cavapoo for months- he's terrible at stealing and guarding toys he steals from my 3yo. We got some great tips from a behaviourist but he's still set on destroying her stuff. Recently he's also started marking around the house constantly- nearly always on my youngest daughter's possessions. I've seen him do it when I'm on a work call and he looks at me as he's doing it so it always feels like defiant behaviour rather than anxious behaviour. The vet thinks he is anxious and neutering will make him worse so I've held off but the marking is driving me crazy. Behaviourist says to keep him in the same room as us and startle him if he marks which is fine in the week but we come unstuck at weekends when the kids are home and running between rooms playing. I try to be on top of it but he was unaccompanied for less than 5 minutes while I was cooking dinner and I've found 3 marking locations (he'd been out for a long walk an hour previously so it wasn't needing a wee) We won't rehome him but I'm so sorely tempted. I get so claustrophobic having him next to me 24/7 and needing to keep all the doors shut. He's making me miserable rather than making our life better.
I'm thinking to just get him neutered as a last ditch hope it would improve his behaviour. It really does feel territorial/ trying to get above the kids in the pack order but I'm honestly struggling now and while we can continue with the behaviourist, the cost is not matching the benefit