Samll pair on the BB, after a raise.

[Dennisa]

Yeah, there is some concern, so as the lower your pair is, the higher your implied odds need to be. Set over set does happen, but very rare. If you get too much heat after you flop the set, then go into check call mode. Most times you will see tptk or two pair giving you the most heat.

I think what you need to be more worried about is when you fill up as an underboat and the paired card is connected with the last card. Somone with 2 pair just filled up and then you also need to go into check / call mode.