Just an initial comment. If YOU are not getting shocked, your small dog should be well OK. If you ARE getting a jolt, it's time to investigate and bond or ground what's causing it!
As to switching to a biguanide...be aware that such products are on the downturn, and even Chemtura (BioGuard), who spent so much time and legal energy (and $$) getting hold of a biguanide formula, is going to discontinue it.
I'm not a biguanide fan, in that it's expensive, proprietary (you'll have trouble finding anything generic), and has a useful run in most pools of 3-5 years.