i love my pearls and have never gotten blisters. try changing socks? if your foot slips around to much it may be causing friction and heat. which pearls?
just got some syncrofloats (where do these names come from...?) and so far so good... just ran an easy 5 miles to test them out and they feel pretty good. plus they look pretty kick-ass.
I have an australian shepherd and he LOVES to run. In fact you have to run them or else they'll find ways to get in trouble when you're not around. I run him in the morning for 4 miles and then my wife will run him in the afternoon. They are great...