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AeeekI would say that is is a tick. I would also say the best form of action is to take the dog to the vets to get it removed. Ticks can carry an illness called Lyme disease. This illness can kill your dog. Please take your dog to the vet. If you try and get it out and leave the head in the dog it will cause all sorts of problems.
Many years ago when I lived in Singapore we had a dog. Our dog picked up ticks every day and every night she had to have the 'ticks' removed. I kept tweezers next to a creamy solution and carefully removed each tick. So I would ahve been at the vets daily. Now and then a tick would release itself from the dog and crawl up our wall. That usually happened when we had visitors. Typical eh.