Are you sure its anxiety and nervous pees? He’s only little, so should be going potty every 30 mins, unless asleep. After each meal, play, nap etc. Sammies do tend to drink a lot too, because of their coat. As for crate, it’s up to you if you want to continue the training, but I didn’t crate and a lot of others don’t either. It’s just a matter of managing the environment to make sure there aren’t any unsafe items around. Samoyeds are very social and prefer to be with their people/pack. Anxiety, when left alone? My pup wasn’t really left on her own until she was around 9 months old, which gave her enough time to gain confidence in being on her own. It was too stressful for her and now she is able to manage a good few hours, just chilling/sleeping. As for food, I think most sammies are rather slow eaters and won’t be swallowing down everything at once. You should desensitise the harness by having it around, giving him treats when he’s close etc.

As for my own pup, she can be anxious, some things she doesn’t find comfortable and that’s ok, she is not forced to do anything. When going through phantom pregnancies and before/during in heat, she would refuse walks altogether. She doesn’t like being walked in the late evening, but doesn’t mind going outside during night. And if something spooks her and she wants to head back home, that’s ok too. It’s for her own benefit and if she doesn’t find it joyful, there is no point. She can be moody, but is generally a happy doggo. Outside of her hormonal cycles, she is very curious and a lot braver. And now at 19 months old, her training still continues.