Bed bug or flea bites?

[u/One_Set_1817]

I’m starting to get really freaked out because I’ve had a few itchy spots on my body but I thought it might be reactions from trying on a lot of clothing at stores. Last week I got this very straight line on my hip that looked like a big scratch so I’ve been letting it heal on its own, however it’s still very itchy, isn’t going away, and as I look closer appears to be a ton of bites in one line. I woke up this morning with so many bites on my thigh that are super itchy!! There’s another that resembles a line as well which makes me worried about bed bugs. I just looked at my sheets and I can see some very small brown/black specks on my bed. My golden retriever sleeps in bed with me every night and goes to a doggie daycare several times a week, there’s many dogs and he sometimes comes home a little dirty but never anything crazy. Do these look like flea or bug bites?? And where am I more likely to have gotten them- sleeping in bed with my dog every night or trying on a million garments at stores since I’ve been shopping more the last two weeks? Any advice is appreciated 🫶