Nope, no bed bugs anywhere.
There's no wooded area around my house or any bushes. My dog takes shower 2 times a week.
Your dog goes outside, is there a wooded area or some underbrush he frequents? He might be a carrier (literally), fleas hop onto him, then drop off onto the carpet, then up onto you and your sister's clothing. He may have a high pain tolerance and rarely bothers stratching flea bites. They get thirsty too so if they're on him they're apt to be in his neck or face hair.
Or, could be bed bugs. Bring any suspiciously bargain priced or free used furniture or luggage into the house lately? Though in theory, they could simply fall off a visitor's clothing.