I don't buy flee killer for back at Pet Smart, could5find it. But Big lots & Walmart sells Hartz. Less than 10 dollars. But how ever, I had to change to Timeline from my Veterinary, quality is better though it was $89.00 oppose to $5.00 to $10.00. I use to buy Advantage Flee killer for back, if you can find it, it will run you from$32.00 -$54.00 at Pet Store but this was in Stockton were I used to live.
Not sure but if you call them they have great customer service
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