When they are teething, you will usually be able to pick up on the following signs:
The puppy will chew a lot more - haha, we all know about Trigger's chewing habits, so this could be the cause.
You might see some blood in his mouth, coming from his gums. This is completely normal and nothing to worry about.
Puppies may experience a lot of pain while they are teething and they may become disinterested in playing. The puppy may also experience diarrhea and a change in appetite.
The puppy might show more signs of aggression and will start biting everyone and everything in sight. If you feel like you don't have enough control over him, it would be a good time to start obedience training.
To help with the discomfort of teething, you can try some of these toys by Petstages: http://www.apetslife.co.za/detail.asp?c=1&s=7&t=96&p=5119&x=0&afl=13
And you can try this natural remedy: http://www.apetslife.co.za/mail_friend.asp?c=1&s=89&t=315&p=6583&x=&afl=13
A dog behaviorist notes that if you find the puppy chewing on the wrong thing, you should only redirect its attention and not reprimand the puppy because it will cause them to chew the wrong things for attention from you. Personally, I use a firm "uh-uh" with my dogs and then I redirect them, but no scolding or harsh tones.
I hope that answers your questions

He might also be crashing because he is a puppy - Cash used to be like that all the time. Run, run, run & then plop, and he's asleep. As long as he is eating and drinking water

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