Depends. Do you know how much your bully will weigh or anticipate by their parents? When Spud hit 45 lbs at 8-9 months and I had three months left of heartgard plus for dogs weighing 26-50 lbs. I think by the time I got to the last dose which was recently he was a little right around 51-53 lbs. I have since order his next six month supply for dogs weighing 50-100 and same goes for his Advantix topical.
Weigh your pup and think about how much they may weigh and anticipate that.
i ended up buying one thats called ivomec, its supposed to be for cattle. It can be given through injection or oral its more effective and cheaper and will last forever. all the reviews are from dog owners
Thats what i plan for my two this year-it is the same ingredents as the heart worm chewables- you just dont pay for the inactive filer ingredents like flavors, dyes and flour.
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Weigh your pup and think about how much they may weigh and anticipate that.