I have a 13 year old boxer my question is what would it mean if his testicle look like one

Tonight my boxer has started scratching his ear like crazy and crying while he’s scratching. I think he might have mites but when I try looking he cries more and pulls away. How can I make him comfy till we see the vet in the morning

I am at work but, my husband is at home and just called saying he gave Paige, our Boxer her Heartgard and she vomited about 30 minutes later. He cannot tell if the Heartgard was in the vomit or not. Is it safe to give her another one later or tomorrow?

Thank you,
Dawn Gillispie