hay mites static lice

my new boar that I've just bonded with my older one has hay mites! Any suggestions on how I could get rid of them without a bath? He's only 4 weeks old so I don't want to bathe him too soon!

There are tiny black dots on my guinea pigs almost microscopic they do not move and they are not coming off of my guinea pigs I haven't been able to find anything to get rid of them since many of my local Pet shops do not carry what is advised to use online is there anyone with any sort home...