How would you administer clavamox? and at what dosages?

I don't have any at the moment but I do have some Amoxicillin. Will this work as a substitute? I am 95% confident my bitch does not have mastitis though. Her milk looks normal: No blood, foul smell, weird discharge or odd color. The teats are dropping but are soft and warm but not hot.

The pup survived the past few nights, seemed to respond after I rubbed him a bit, but it takes me 3-5 attempts every hour apart to finally get a good 3 hrs of undisturbed sleep.