I am not sure if I am being paranoid or what.

Carlos seems to be scratching a lot lately and I am pretty sure he does not have fleas because I give him a once a month spot on treatment, brush him with a flea comb occasionally, and he was just at the groomers last weekend and I think she would have said something if she saw bugs. It seems like he kinda bits and scratches at right between his tail and his wee-wee

I am not sure if he is just itchy or it is something more. I give him a bath once a week usually and have been using the same shampoo since he was a pup.