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This is just a general advice rather than an answer to one of your questions. Puppies love tennis balls, why wouldn't they? Our, now eight year old, puppy has loved them all his life and takes them on walks or finds them himself. He can skin and gut a tennis ball in about three minutes, if so inclined.
We were warned by our vet but we didn't listen, "Do not let your dog have a tennis ball as they are very abrasive", she said.
Our dog has not got a pointy tooth left in his head, they've all been worn flat by the chewing bloody tennis balls.
Avoid anything that can be ripped apart as it will end up inside the puppy.
We got a puppy just before Christmas.I don't know if it's helpful, I spent a couple of nights making lots of trips down to him and sitting outside his crate until he fell asleep, then creeping back up to bed. He felt happy enough when someone was around, just cried on his own.
It was pretty hard for a few days (and I've no idea if it's the recommended approach, but leaving him crying was too upsetting). However, he now goes in his crate and (just about, couple of attempts sometimes) stays in it and sleeps on his own when told to. We don't lock the door to the crate.
He won't sleep through the night though! Everywhere I read says not go go down to them if they start whining or barking in the night, but we can't exactly leave him barking at 3am - we have neighbours! Hopefully that'll sort itself out soon...