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Hi, thanks for getting in touch. Sorry to hear about what's been going on. It sounds like one of two possibilities to me. Either you are having a degree of allergic reaction to the dog, possible but I would have expected it from when dog came in but can happen like this still. Otherwise you should also make sure the dog doesn't have fleas which are biting you and I'd advise getting a tube of dog flea treatment to be sure. For the pimples themselves on your legs you can buy some 1% hydrocortisone cream from any pharmacy and apply that to your legs twice a day for 1 week and it should disappear. I hope that helps, all the best.
You're very welcome, come back if you've further questions. All the best :)