I have never had any problems with biting....
I change Riley's peepee pads after every 2 - 3 piddles.... but it also depends on how Big the piddles are. Sometimes he can go once and it will be a Huuuuuge one.... I'll change that right out. Other times, he will piddle 2 - 3 times, and they will be size of dimes.
I get the Clean Go Puppy Pads and get them from Amazon.
I get 100 for about $29 + Free Shipping.
Good Luck!