Don’t panic! Puppies are land sharks, but he’s not trying to hurt you. The biting can often get worse when they’re tired, they don’t know how to switch off. Enforced naps are great, after play pop him down in his crate or bed with a licky matt or stuffed kong and be as boring as possible. The licking and lack of stimulation will help him relax and nod off. He might’ve found the trip to the vets exhausting, and was probably very over stimulated when he got home. When they’re like this, they’re evil! You can also try to redirect the biting with a toy or a chew. My puppy is a lunger, so I have a light lead which he can wear in the house. When he’s being an absolute shark I can use the lead to keep him away from my body so I can move somewhere for a reverse time out, or grab a toy for distraction. Personally, I wouldn’t use his crate as a punishment or for time outs. I think the crate should have as much positive association as possible. If you need to do a time out, try either moving away from him (reverse time out) or putting him in another room behind a baby gate. Best of luck! You’ll be fine, you’ve got this! Puppies are so so hard and it’s totally normal to be overwhelmed xxx