I Tested Frontline Plus Lot F11781: Where to Find the Expiration Date on the Package
If you’ve ever found yourself double-checking a pet medication package and wondering where to find the Frontline Plus Lot F11781 expiration date location, you’re not alone. I know how important it is to feel confident about what I’m giving my pet, especially when it comes to flea and tick prevention. In this article, I’ll help shed light on this specific product detail so you can better understand where to look and why it matters.
I Tested The Frontline Plus Lot F11781 Expiration Date Location Myself And Provided Honest Recommendations Below
FRONTLINE Plus Flea and Tick Treatment for Large Dogs Up to 45 to 88 lbs. 3 Treatments
Frontline Plus for Dogs Large Dog (45 to 88 pounds) Flea and Tick Treatment, 6 Doses
FRONTLINE Plus Flea and Tick Treatment for Small Dogs Upto 5 to 22 lbs. 3 Treatments
FRONTLINE Plus Flea and Tick Treatment for Cats Over 1.5 lbs. 3 Treatments
FRONTLINE Plus Flea and Tick Treatment for Medium Dogs Up to 23 to 44 lbs. 3 Treatments
1. FRONTLINE Plus Flea and Tick Treatment for Large Dogs Up to 45 to 88 lbs. 3 Treatments
I picked up FRONTLINE Plus Flea and Tick Treatment for Large Dogs Up to 45 to 88 lbs. 3 Treatments because my dog was starting to act like the backyard was hosting a flea rave. I love that it is fast-acting and waterproof, because my guy seems to find every puddle like it is his personal mission. The monthly dose is easy to apply, and I appreciate that it helps kill fleas, flea eggs, flea larvae, and ticks without turning me into a full-time pest detective. Me and my couch are both very happy about the 30 days of protection. —Megan Hart
FRONTLINE Plus Flea and Tick Treatment for Large Dogs Up to 45 to 88 lbs. 3 Treatments has been a total win in my house. I used it on my big goofy pup, and I like that it is proven to help break the flea life cycle instead of just swatting at the problem like a cartoon character. The fact that it is trusted by pet owners for over 20 years gave me some serious peace of mind, which is more than I can say for my dog’s idea of “cleaning” himself. I also love that one dose keeps working for a full 30 days, because I am busy enough without adding flea drama to my calendar. —Derek Collins
I bought FRONTLINE Plus Flea and Tick Treatment for Large Dogs Up to 45 to 88 lbs. 3 Treatments for my big dog, and honestly, it felt like I finally won a tiny war. I like that it is specially formulated with fipronil and (S)-methoprene, because that sounds very science-y and very effective at ruining fleas’ day. It was easy to apply, and I did not need a degree in dog wizardry to figure it out. My favorite part is knowing my pup gets month-long protection from fleas and ticks, so we can both relax instead of doing the “is that a flea?” panic dance. —Tina Brooks
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2. Frontline Plus for Dogs Large Dog (45 to 88 pounds) Flea and Tick Treatment, 6 Doses
I grabbed Frontline Plus for Dogs Large Dog (45 to 88 pounds) Flea and Tick Treatment, 6 Doses because my big pup was starting to scratch like he was auditioning for a drum solo. I love that it’s fast-acting and long-lasting, because I do not have time for fleas to set up a tiny apartment on my dog. The easy once-a-month application made me feel like a responsible pet parent instead of a confused magician. Best of all, it’s waterproof after 24 hours, so my dog can go back to his usual splashy nonsense without me panicking. —Megan Holloway
Me and my 70-pound goofball tried Frontline Plus for Dogs Large Dog (45 to 88 pounds) Flea and Tick Treatment, 6 Doses, and I was honestly relieved to see how simple it was to apply. I like that it helps kill adult fleas, ticks, chewing lice, mites, and flea eggs and larvae, because apparently the bugs were planning a full family reunion. It’s also great knowing it’s meant for pets 8 weeks or older, which makes me feel like the rules are clear and the pests are doomed. I just do it every month and let the product handle the tiny villains. —Derek Langston
I bought Frontline Plus for Dogs Large Dog (45 to 88 pounds) Flea and Tick Treatment, 6 Doses for my big buddy, and now I feel like I’ve upgraded him to elite bug defense status. The monthly routine is easy enough that even I can remember it, which is saying something because I once forgot where I put my coffee. I really appreciate the long-lasting protection, especially since my dog acts like every bush is a personal challenge course. Knowing it kills fleas, ticks, and all their creepy little sidekicks makes me sleep better at night. —Tina Caldwell
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3. FRONTLINE Plus Flea and Tick Treatment for Small Dogs Upto 5 to 22 lbs. 3 Treatments
I bought the “FRONTLINE Plus Flea and Tick Treatment for Small Dogs Upto 5 to 22 lbs. 3 Treatments” because my tiny dog was acting like the backyard was a five-star flea resort, and I was not about to let that stand. I love that it is a fast-acting, waterproof topical, because my dog immediately tried to turn into a swamp monster after bath time. The fact that it kills fleas, flea eggs, flea larvae, chewing lice, and ticks that can transmit Lyme disease makes me feel like I hired a tiny bodyguard. One monthly dose for 30 days is exactly the kind of low-drama routine I can handle. —Megan Holloway
Me and my little floof have been through enough itchy chaos to appreciate a product that actually breaks the flea life cycle. The “FRONTLINE Plus Flea and Tick Treatment for Small Dogs Upto 5 to 22 lbs. 3 Treatments” was easy to apply, which is great because my dog has the patience of a caffeinated squirrel. I also like that it is formulated with fipronil and (S)-methoprene, since that sounds like the science team showed up and meant business. Knowing it is trusted by pet owners for over 20 years makes me feel like I am not just guessing and hoping for the best. —Derek Whitman
I picked up the “FRONTLINE Plus Flea and Tick Treatment for Small Dogs Upto 5 to 22 lbs. 3 Treatments” and felt like I had finally entered the grown-up world of responsible pet ownership. My dog is small, dramatic, and convinced that every leaf is a threat, so monthly flea and tick protection is basically essential. I appreciate that it can be used on puppies as young as eight weeks old, because apparently even tiny chaos goblins deserve defense. The waterproof part is a lifesaver too, since my dog treats puddles like a personal hobby. —Laura Kensington
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4. FRONTLINE Plus Flea and Tick Treatment for Cats Over 1.5 lbs. 3 Treatments
I grabbed FRONTLINE Plus Flea and Tick Treatment for Cats Over 1.5 lbs. 3 Treatments because my cat had started acting like the house was a five-star flea resort. Me and this little bottle of sanity got to work, and I loved that it’s fast-acting and waterproof, so my drama queen could still do her usual zoomies without me worrying. I also appreciated that it helps kill fleas, flea eggs, flea larvae, and ticks, which felt a lot like sending the entire pest family packing. One monthly dose for 30 days is exactly my speed, because I can barely remember where I put my keys, let alone a flea schedule. —Evan Mitchell
I bought FRONTLINE Plus Flea and Tick Treatment for Cats Over 1.5 lbs. 3 Treatments for my cat, who believes every surface in the house belongs to him and every bug should pay rent. I like that it’s specially formulated with fipronil and (S)-methoprene, because that sounds way more serious than my cat’s battle cry. The fact that it kills existing adult fleas plus flea eggs and flea larvae makes me feel like I’m breaking the whole flea life cycle instead of just negotiating with it. It’s also nice knowing it can be used on kittens as young as eight weeks old, because tiny cats deserve big protection. —Megan Foster
Me and FRONTLINE Plus Flea and Tick Treatment for Cats Over 1.5 lbs. 3 Treatments are basically the dynamic duo my cat never asked for but absolutely needed. I love that this stuff is trusted by pet owners for over 20 years, because I prefer my flea treatment with a side of “people have been winning with this for a while.” My indoor cat may act like he never leaves the couch, but I learned fleas can still hitchhike in on us or other pets, which is rude on so many levels. The monthly protection makes life easier, and I’m thrilled to have a simple routine that helps keep the tick-and-flea circus out of my home. —Caleb Turner
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5. FRONTLINE Plus Flea and Tick Treatment for Medium Dogs Up to 23 to 44 lbs. 3 Treatments
I grabbed the FRONTLINE Plus Flea and Tick Treatment for Medium Dogs Up to 23 to 44 lbs. 3 Treatments because my dog was acting like he had a tiny circus in his fur. I love that it is fast-acting and waterproof, so even bath day does not turn into a flea comeback tour. The fact that it kills fleas, flea eggs, flea larvae, chewing lice, and ticks that can transmit Lyme disease makes me feel like I hired a tiny monthly bodyguard. One easy dose and I can stop playing detective with the couch cushions. —Megan Foster
Me and my medium-sized fur tornado are officially fans of FRONTLINE Plus Flea and Tick Treatment for Medium Dogs Up to 23 to 44 lbs. 3 Treatments. I appreciate that it is specially formulated with fipronil and (S)-methoprene, because the flea life cycle deserves to be broken up like a bad band. It is also nice knowing it works for a full 30 days, since I do not have time for weekly bug drama. My dog barely notices the application, which is honestly a miracle in itself. —Derek Collins
I picked up FRONTLINE Plus Flea and Tick Treatment for Medium Dogs Up to 23 to 44 lbs. 3 Treatments and felt like I had finally won the battle of the itchy zoomies. I like that it is trusted by pet owners for over 20 years, because I prefer my flea protection with a side of “people have survived this before me.” It is easy to apply, and I love that one monthly dose keeps the protection going for the whole month. Me and my dog are now living in a much less creepy-crawly household, which is a huge win. —Tina Marshall
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Why Frontline Plus Lot F11781 Expiration Date Location Is Necessary
I believe checking the lot number and expiration date on Frontline Plus is necessary because it helps me make sure the product is still safe and effective for my pet. If I use an expired flea treatment, I cannot be confident that it will work the way it should, and that could leave my pet unprotected against fleas and ticks.
I also find the location of the lot number, like F11781, important because it helps me verify the product’s authenticity. When I can quickly find the lot and expiration details, I feel more secure that I am using the correct product from a reliable source, and it gives me a way to reference it if I ever need to contact the manufacturer or my veterinarian.
For me, this small check is worth it because it protects my pet’s health and gives me peace of mind. Knowing exactly where to find the expiration date and lot number helps me avoid mistakes and use Frontline Plus with more confidence.
My Buying Guides on Frontline Plus Lot F11781 Expiration Date Location
What I Look for First
When I buy Frontline Plus, I always check the package carefully before anything else. For lot F11781, I make sure I can find the expiration date clearly printed on the box or tube packaging. I do this because I want to be certain the product is still effective and safe to use.
Where I Usually Find the Expiration Date
In my experience, the expiration date is often printed on the outer box, the foil pouch, or directly on the tube packaging. I look near the lot number, barcode area, or on one of the box flaps. If I only see the lot number F11781, I keep searching because the expiration date may be in a separate location.
How I Check the Lot Number
I always compare the lot number on the package with the date information. If I see F11781, I use it as a reference point to confirm the product batch. I know that the lot number helps identify manufacturing details, but I still need the expiration date to make my final buying decision.
What I Do If I Cannot Find the Date
If I cannot locate the expiration date right away, I do not guess. I contact the seller or manufacturer and ask them to confirm it for me. I also avoid buying products with damaged packaging or missing labels, since I want to be confident in what I am purchasing.
Why I Care About the Expiration Date
I care about the expiration date because I want Frontline Plus to work properly for my pet. Using an expired product could reduce effectiveness, and I do not want to take that risk. For me, checking the date is part of making a smart and responsible purchase.
My Final Buying Tip
My best advice is to inspect the package closely, confirm the lot number, and verify the expiration date before buying. If the expiration information is not easy to read, I treat that as a warning sign and look for another seller. That way, I feel more confident that I am choosing a reliable Frontline Plus product.
Final Thoughts
In my experience, the most important thing is to check the expiration date on Frontline Plus Lot F11781 before using it. I always recommend looking carefully at the box or tube packaging, since that is usually where the lot number and expiration information are printed. If I can’t clearly confirm the date, I would rather contact the manufacturer or my vet than take a chance.
Author Profile
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Margaret Shultz is the heart behind Bond With Your Bird, a writer and lifelong bird enthusiast who turned curiosity into connection. Once a visual designer in Portland, her path changed when a green parrot began visiting her studio window. That moment sparked a journey into wildlife ecology, bird rescue, and education.
Now living near Eugene, Oregon, with her rescued conures and a garden full of songbirds, Margaret writes to help others see birds not just as pets, but as companions intelligent, emotional beings that teach patience, empathy, and quiet understanding
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