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Trifexis question IRT dog weight

28,619 Views | 14 Replies | Last: 9 yr ago by hurricanejake02
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SoulSlaveAG2005
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Similar issue for us. Our two terrier are 15lbs and one that varies between 18-22lbs. Last time at vet, he was 22, and the vet threw a fit that I was only going to buy 1 box and split between the two. I was insistent and they said it had to do with warranty from trifexis that it won't cover heart worm treatment if we didn't give correct dosage for noted weight... I'm not too worried as it is winter and dog usually packs lbs on for winter and then loses them in spring/summer when mosquitoes come back out...

I'm not DVM, but I think they should be fine..
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DVM97
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Vets can be a peculiar bunch, I'm not going to comment on my protocol, but I've seen some crazy "rules" that some vets adhere to.

DVM
AginNoCo
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Well the pills are based on weight. So if they are heavier right now, they should get a higher dose. If not, they could get heart worms. Also promotes drug resistance. So refusing you the wrong pills is the ethical thing to do.

Do you really want to spend all that ,only and stop short of doing it right?

*not a vet....but I asked one
SoulSlaveAG2005
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AginNoCo said:

Well the pills are based on weight. So if they are heavier right now, they should get a higher dose. If not, they could get heart worms. Also promotes drug resistance. So refusing you the wrong pills is the ethical thing to do.

Do you really want to spend all that ,only and stop short of doing it right?

*not a vet....but I asked one


They are based on weight,but when your dog is on the borderline weight it seems silly that 1lb is the determiner between efficacy and or resistance. Especially when in a 3-4 months that Same dog will be 1-2 lbs below the weight lines.

We get they have to have a cut off for warranty exposure and liabilities but in a practical sense, your 21 lb dog is no more at risk that when he is at 20 lbs.
AginNoCo
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SoulSlaveAG2005 said:

AginNoCo said:

Well the pills are based on weight. So if they are heavier right now, they should get a higher dose. If not, they could get heart worms. Also promotes drug resistance. So refusing you the wrong pills is the ethical thing to do.

Do you really want to spend all that ,only and stop short of doing it right?

*not a vet....but I asked one


They are based on weight,but when your dog is on the borderline weight it seems silly that 1lb is the determiner between efficacy and or resistance. Especially when in a 3-4 months that Same dog will be 1-2 lbs below the weight lines.

We get they have to have a cut off for warranty exposure and liabilities but in a practical sense, your 21 lb dog is no more at risk that when he is at 20 lbs.
Do what you want, but they do have cut offs for a reason. And in your case 2 lbs is 10% difference. When he is below at the time it is easy to do less. But go ahead and argue with the professional you are spending hundreds of bucks at for their professional knowledge. Talk about silly.
aggie4christ22
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I just go the dose up. I have 4 dogs, the smallest is 40 pounds and the biggest 60. They are on Sentinel (weight break at 50#) because they hate taking Trifexis. I just give everybody the 51-100# dose. I am a vet. I would rather err on the side of too much (all are tested at >5x the label dose for side effects) than not enough.

Edit to say - you could try changing brands - as Heartgard and Sentinel both have 51-100 pound boxes. Sentinel has flea prevention in it (sterilizes adult fleas), HG does not so you'd have to pair with NexGard/Bravecto/Seresto etc. The cheapest combo is typically HG + Seresto (8 month flea/tick collar) - just no protection against whipworms.
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AginNoCo
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third coast.. said:

i bet my dog could take a poop that got him down to the cusp.

That's a load of crap.
SoulSlaveAG2005
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AginNoCo said:

SoulSlaveAG2005 said:

AginNoCo said:

Well the pills are based on weight. So if they are heavier right now, they should get a higher dose. If not, they could get heart worms. Also promotes drug resistance. So refusing you the wrong pills is the ethical thing to do.

Do you really want to spend all that ,only and stop short of doing it right?

*not a vet....but I asked one


They are based on weight,but when your dog is on the borderline weight it seems silly that 1lb is the determiner between efficacy and or resistance. Especially when in a 3-4 months that Same dog will be 1-2 lbs below the weight lines.

We get they have to have a cut off for warranty exposure and liabilities but in a practical sense, your 21 lb dog is no more at risk that when he is at 20 lbs.
Do what you want, but they do have cut offs for a reason. And in your case 2 lbs is 10% difference. When he is below at the time it is easy to do less. But go ahead and argue with the professional you are spending hundreds of bucks at for their professional knowledge. Talk about silly.


Actually when they are below that weight you can not do less as they are a single pill.

Here is their weight chart and dosage:



It is silly to think a .1 lb increase in weight needs about double the dosage than the 20lb dog. Especially when for 8-9 months out of the year the dog weighs less.

We can go round and round on this and neither will change our mind. If my boy dog was 22lbs + most of the year, especially during mosquito seasons I would probably get the higher dosage but he is the opposite and it doesn't make sense to spend an extra $100 for a 6 month supply that he will weigh too less for in 3 months.
SoulSlaveAG2005
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third coast.. said:

i bet my dog could take a poop that got him down to the cusp.



I bet he could take poops that put our dogs to shame...
mpl35
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Can you buy both sizes?. Expiration dates are usually a long time out. Use as needed!
bmfvet
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The weight cut offs are based off a dose range (low to high). These preventatives address more than just heartworms, they also help treat intestinal parasites, some of which are zoonotic. The state board or judge isn't going to support the vet if they said "but the weight wasn't that much over" and the manufacturer isn't going to back their product if it is underdosed. It's not worth risking my license over, and changing up one weight class isn't going to break the bank. I had a client arguing with me about it Monday for several minutes. He then said he's only been over the weight cutoff this visit. When I showed him that the dog had been over the last 4 visits and they had been buying the correct size on those visits, he at least conceded.
IslandAg76
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The heartworm preventive would "probably" be effective for the dog a couple pounds over the weight on the dosing chart.

"Probably"

Every DVM has been bit in the butt by the person who says they will assume the risk for expediency and ease. Then the expedient/easy way doesn't work and now the person no longer wants the risk they previously assumed and it is the DVM's fault.

There is a right way...that is what your Vet is trying to do.

You might consider changing to Heartgard if same dosing is important...their doese range is 51-100 lbs.
Of course no flea efficacy.
hurricanejake02
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What my vet did when my old lab was just over 100 lbs (yeah, she was a little heavy) was give me the 51-100# and a 1-10# dose. Once she got below 100, I just stopped giving the 1-10#.

Seems like you could still get by with your 40-60# dose in bulk, and buy a couple of the 10# doses to keep the vet happy.
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