SKU: 85996959359

Merck SAFE-GUARD® (fenbendazole) Protein Block (25 Lbs)

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Description

Merck SAFE-GUARD® (fenbendazole) Protein Block (25 Lbs)SAFE GUARD 20% PROTEIN BLOCK (fenbendazole) Product Description Type C free choice medicated feed for Beef & Dairy Cattle SAFE GUARD (fenbendazole) Medicated Dewormer for Beef Cattle (20% Protein Block) is indicated for the removal and control of lungworms, stomach worms, and intestinal worms. Indications For The Treatment And Control Of: Lungworms Adult Dictyocaulus viviparus Stomach worms Adult brown stomach worms (Ostertagia ostertagi) Adult and

SAFE-GUARD® 20% PROTEIN BLOCK

(fenbendazole)

Product Description

Type C free-choice medicated feed for Beef & Dairy Cattle

SAFE-GUARD® (fenbendazole) Medicated Dewormer for Beef Cattle (20% Protein Block) is indicated for the removal and control of lungworms, stomach worms, and intestinal worms.

Indications

For The Treatment And Control Of:

Lungworms

  • Adult Dictyocaulus viviparus

Stomach worms

  • Adult brown stomach worms (Ostertagia ostertagi)
  • Adult and fourth stage larvae barberpole worms (Haemonchus contortus)
  • Fourth stage larvae barberpole worms (H. placei)
  • Adult and fourth stage larvae small stomach worms (Trichostrongylus axei)

Intestinal worms (Adult and fourth stage larvae):

  • Hookworms (Bunostomum phlebotomum)
  • Thread-necked intestinal worms (Nematodirus helvetianus)
  • Small intestinal worms (Cooperia punctata & C. oncophora)
  • Bankrupt worms (Trichostrongylus colubriformis)
  • Nodular worms (Oesophagostomum radiatum)

Dosage

One block treats 8,000 lb. (500 lb. of cattle per 1.5 lb.).

Adequate forage must be available at all times to cattle receiving supplemental block feeding.

Safe-Guard® (fenbendazole) 20% Protein Deworming Block (Medicated) is designed for deworming pastured cattle by feeding these medicated blocks for three (3) days only as the sole source of salt. It is essential to establish full cattle adaptation to supplemental block feeding prior to treating cattle with Safe-Guard® 20% Protein Deworming Block (Medicated). Cattle behavior and per capita consumption must be established by feeding nonmedicated 20% Protein Blocks prior to medicated block treatment. Adaptation to block feed intake for medicated treatment may take twelve (12) to nineteen (19) days of prior exposure to unmedicated feed blocks depending on consumption rates and environmental conditions. When cattle block consumption of 0.1 pound (1.6 ounces) per 100 pounds of body weight (or 1.0 pound for a 1000-pound cow) per day is attained for several days on the nonmedicated 20% Protein Block, the three (3) day medicated treatment with Safe-Guard® 20% Protein Deworming Blocks (Medicated) may begin.

For effective treatment, the cattle must consume an average 0.1 pound of Safe-Guard® 20% Protein Deworming Blocks (Medicated) per 100 pounds of body weight each day for the three (3) days of treatment. This is equivalent to an average of one (1) pound per head per day to a 1000-pound cow for the three days of treatment in order to provide a total dose of 2.27 mg fenbendazole per pound of body weight. To commence deworming treatment, replace the nonmedicated blocks with Safe-Guard® 20% Protein deworming Blocks (Medicated). Place these medicated blocks at the same locations where cattle have demonstrated adequate per capita block intake (0.1 pound per 100 pounds of body weight per day).

DAILY TREATMENT (To be continued for three [3] days):

 

Cattle Body Weight
(pounds)
Average Block Intake
(lb/head/day)
Number of Head
Per Block*
500 1/2 16
750 3/4 11
1,000 1 8

 

*NUMBER OF HEAD FULLY TREATED BY EACH BLOCK WHEN CONSUMED IN THREE (3) DAYS.

Following the three (3) day treatment any remaining Safe-Guard® 20% Protein Deworming Blocks (Medicated) should be removed from the pasture and cattle may be returned to their normal supplemental feeding program. Remaining blocks, or portions of blocks, can be utilized for retreatment purposes if used prior to the expiration date shown below.

It is essential that good block feeding husbandry practices be followed at all times. Block feeding techniques include, but are not limited to, a variety of practices. Blocks should be first located in those areas where cattle are seen to browse or loaf. It may be desirable to relocate unconsumed blocks to locations where obvious block consumption is identified. Increased consumption may often be obtained by moving feeding stations into shaded or loafing areas, closer to water source, increasing the number of blocks available to the animals or combinations of these practices. Decreased consumption may often be obtained by the reverse of the above practices.

Drug Feeding Rate

1.67 mg fenbendazole per kg body weight per day for three (3) days. Total dose for the three (3) day period of 5 mg fenbendazole per kg of body weight (2.27 mg fenbendazole per pound).

Do not underdose. Ensure each animal receives a complete dose based on a current body weight. Underdosing may result in ineffective treatment, and encourage the development of parasite resistance.

Active Ingredient

Fenbendazole 750 mg/lb

Storage

Store at or below 25 °C (77 °F).

Warnings

NOT FOR USE IN HUMANS. KEEP OUT OF REACH OF CHILDREN.
The Safety Data Sheet (SDS) contains more detailed occupational safety information. For customer service, adverse effects reporting, and/or a copy of the SDS, call 1-800-211-3573. For additional information about adverse drug experience reporting for animal drugs, contact FDA at 1-888-FDAVETS, or http://www.fda.gov/reportanimalae.

Other Warnings

Parasite resistance may develop to any dewormer, and has been reported for most classes of dewormers. Treatment with a dewormer used in conjunction with parasite management practices appropriate to the geographic area and the animal(s) to be treated may slow the development of parasite resistance. Fecal examinations or other diagnostic tests and parasite management history should be used to determine if the product is appropriate for the herd, prior to the use of any dewormer. Following the use of any dewormer, effectiveness of treatment should be monitored (for example, with the use of a fecal egg count reduction test or another appropriate method). A decrease in a drug’s effectiveness over time as calculated by fecal egg count reduction tests may indicate the development of resistance to the dewormer administered. Your parasite management plan should be adjusted accordingly based on regular monitoring.

CONSULT YOUR VETERINARIAN FOR ASSISTANCE IN THE DIAGNOSIS, TREATMENT AND CONTROL OF PARASITISM.

Important Safety Information

Do not use in beef calves less than 2 months old, dairy calves and veal calves. A withdrawal period has not been established for this product in pre-ruminating calves. Additionally, the following meat withdrawal and milk discard times apply:
Safe-Guard 20% Protein Type C Medicated Block: Cattle must not be slaughtered for 16 days. For use in beef cattle only.

Contact

U.S. only: Merck Animal Health
The Safety Data Sheet (SDS) contains more detailed occupational safety information.
For customer service or to request a copy of the SDS, please call 1-800-521-5767 or email [email protected].
For product questions or to report an adverse event, call 1-800-211-3573 or email [email protected].
For additional information about adverse drug experience reporting for animal drugs, contact FDA at 1-888-FDAVETS, http://www.fda.gov/reportanimalae.
For more information regarding efficacy and safety data, go to http://productdata.aphis.usda.gov
For additional information, please see the product label.

Shipping Notes
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Exchange/Return Notes
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  • Final sale items are not eligible for returns or exchanges.
  • To process your return/exchange, please contact us at [email protected]
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SKU: 85996959359

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4.2 ★★★★★
Based on 12 reviews
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Product Reviews
J
Verified Purchase
Jonathan H.
Fort Morgan, US
★★★★★ 1
Poor quality — squeaker lasts 2 minutes
Color: Blue Squeak Toy, Size: Medium
These balls used to be great quality and long lasting. Something changed about a year ago and now the quality is considerably less to include the squeaker becoming inoperable within 2 mins of play. Not sure if the raw materials or the manufacturing process changed, however the decline in quality is obvious. I do not recommend this product to anyone who has a dog that is larger than 10-15 lbs.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on April 16, 2026
L
Verified Purchase
LizO
Los Angeles, US
★★★★★ 4
STROBE: Favorite Ball, durable, decent battery life
Color: Glow in the Dark Strobe Toy, Size: Medium
*Update since Outward Hound redesign: The new version doesn't seem to light up as consistently on every bounce and seems to light up in a more seizure inducing way (I'm sorry I couldn't think of a better description). The light also seems to die much faster with the new version. The inner light and batter actually popped out its encasement in one ball after about 2 months of use, only by my Golden who doesn't chew particularly forcefully on it. I did notice right away and check regularly for damage, just putting that out there as a warning. It is still by far my dog's favorite ball. Original: This is my Golden Retriever's absolute favorite ball! Particularly the strobe light up ball but she's happy with any Planet Dog ball to the point that she looks at me for the "good ball" to fetch with if i try to have her play with a ball from a different company. Pros: by far my dog's favorite ball - good bounce, and good squish factor yet durable -larger size: safe for large dogs -lights up to see at night -decent battery life -rain does not affect battery Cons: -battery is not replaceable/ rechargeable (though I'm not sure it's an option without seriously altering the design) -regular glow (once battery is dead) is not great -only lights up on a bounce and shortly after that - If your dog bites down particularly forcefully it can displace the battery which typically kills it; if submerged in water (my dog tends to place it in her water bowl when she takes a break while fetching), it is reduces battery life, both make me worry about safety The ball always out lasts the lifespan of the battery for the light, I'd say we average about 1 month per ball while the light works with about 1 hour of use almost everyday. The ball does hold up to some of my dog's friends that are super chewers including one that is a Cane Corso. I don't let them sit and work at chewing it but they definitely squeeze it in their mouths with a good bit of force. My girl is happy to play with the ball even once the battery dies but I prefer to have the light so I can find the ball when needed. The glow color does glow when placed under a flashlight for a few minutes first but I find it doesn't glow as well or as long as other company's glow toys. My dog has a tendency to drown it in her water bowl to keep it nearby or rinse off any dirt and that definitely shortens the battery life but using it in the rain doesn't seem to affect the battery life I think this being my dog's favorite has to do with the good bounce and squeeze factor this ball has. I like that it's slightly bigger than a tennis ball so I'm comfortable with large dogs playing with it. It fits in the "large" chuck it ball launcher. I actually discovered this specific ball when another dog had it and my dog kept taking it instead of her other light up ball that she had played with happily for months.
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Reviewed in the United States on September 10, 2023
S
Verified Purchase
Sherry
Bozeman, US
★★★★★ 5
Great for my pitbull, worth the price! the warranty isn’t what it seems so check their site first.
Color: Orange Squeak Toy, Size: Medium
I’ve now purchased 3 and I don’t see myself ever stopping! My 55lb Staffie (pitbull) has absolutely obliterated every ball and toy (rope, rubber, stuffed) before this one in a matter of minutes. You take your eyes off it, and the next time you’d look back it would be in pieces. Kong Xtremes and other “indestructible” toys only lasted a week, tops. He also goes nuts for anything that squeaks, so keeping him happily entertained for a while was a challenge because the second he’d chomp down on a squeaker, it’d break. He’s now had this blue squeak ball for a MONTH and it STILL SQUEAKS!! He regularly falls asleep with it still in his mouth, or tucked under his chin. That’s how obsessed he is with this thing. I would 100% recommend this to anyone who needs a seriously durable toy for their super powerful chewer as that’s been my experience! This material is super bouncy and he can bite down (unlike some rubbers, Kong/West Paw) without puncturing it somehow. It’s perfect for fetch, and floats too. He’s never had a toy last this long, so this is a welcome break for my wallet despite being a more expensive toy. I was buying a few toys every week until we tried this one! Cons: The first two balls didn’t squeak after a few days, so maybe they’ve improved something since then. The warranty replacement process is more tedious than others like West Paw, and only replaces them ONCE. It’s also requires more force to squeak this given the nature of the material, but since it extends the life of the squeaker I’m totally fine with it.
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Reviewed in the United States on December 13, 2018
M
Verified Purchase
Michael F
Natrona Heights, US
★★★★★ 5
This ball has lasted and still have it after many months or longer. My dog loves it.
Color: Pink Squeak Toy, Size: Medium
My Belgian Malinois can really chew through inferior play toys and balls, etc., and this is one of the few that has lasted a long time, and he really likes it. Another bonus is that it gets quite slippery with his saliva and the ball will bounce a little bit unevenly, so it can either slip out of his mouth or bounce in an unexpected direction that can fool him. He has such quick reactions that is hard to get a ball past him, but with this ball, I can score extra points on him when he can't block it. Otherwise I have no chance, and he beats me every time.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on October 21, 2025
S
Verified Purchase
stlvapegurl
Birmingham, US
★★★★★ 3
Please go back to the original ball design and squeaker!!
Color: Pink Squeak Toy, Size: Medium, Color: Pink Squeak Toy, Size: Medium
Review update: I am updating my review for a few reasons. 1) The ball I ordered below was the 3rd time I purchased it. I originally bought one years ago, Pre-Covid, for my old pitty. My now Corgi, Jett loved that ball so I got a 2nd one for times when we couldn’t find the original. Well, the ball was slightly larger, the squeaker stopped working, and Jett preferred the original. 2) The newest one doesn’t squeak at all and is also slightly larger than the original. The original fell down the sewer drain that is in our backyard, and we lost the 2nd ball, so we ordered the ball again. My husband ended up having to retrieve the original from the sewer drain because Jett would pace around the sewer looking for the original. I ended up returning the 3rd ball because Jett doesn’t want anything to do with it & it doesn’t squeak. The video I provided is Jett squeaking the original that is at least 5-6 years old. I highly recommend the company go back to the original design that has not only stood the test of time and heavy use but is also the preferred size and for some reason has a much better, more reliable squeaker. I bought 2 of these balls for my Corgi mix and another for my son’s girlfriend’s Golden Retriever. Both dogs love the ball. They love the squeak and the ball is very durable. The ball doesn’t easily squeak by hand but will when they bite down on the ball or when it bounces. Speaking of, it has a decent amount of bounce to it too. Our dog loves to jump in the air to catch it after it bounces off the ground. I highly recommend this ball for medium and large dogs.
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Reviewed in the United States on December 24, 2023

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