Do dogs get mosquito bites?

[nymph]

Last night while petting Diego I discovered some red spots on his shoulder and belly. He's a mix of golden/lab retriver. I'm not sure if this is normal for a retriever as they have 2 coats. It seems to bother him a lot he's scratching a lot more lately.

I've heard that giving him children's benedryl would help, but what dosage? Is there any holistic methods to keep the bugs away?

Diego's on Revolution, so I do tend to think that the red spots are in fact mosquito bites, but can they be anything else?