Hi! When dogs are around livestock and poultry and in multi dog households, it's good practice to de-worm every 6 months.
Most vets breeders, rescues, shelters and hobbyists use one of these. Safe for dogs, puppies, cats and kittens over 4 weeks.
The larger quantities are labeled for livestock but the active ingredient is very safe. Most use liquid for proper dosing.
Safeguard and Panacur have the same active ingredient, Fenbendazole. The 10% solution is quite safe for dogs, given at a dosage of 1cc per 5 lbs body weight once daily for 3 days.
Strongid or generic (Pyrantel Pamoate) 50mg/ml concentration is another very safe de-wormer. Also very cost effective. That dosage is 1cc/10 lbs body weight once, then repeat in 10 days.
When ordering, be sure of the concentration for proper dosage. I've put those in bold.
This information is absolutely correct. you can buy these dewormers online. Panacur is my favorite I buy it in 1000ml bottles to keep due to rescuing and my own pets. Three days in a row will kill all intestinal worms except tape worms. Five days in a row will treat giardia as well. Deworming if they don't have worms will not hurt the dog. I use it regularly because my dogs and horses all live together and horses naturally carry a worm burden. Ivermectin is only dangerous to herding breeds unless overdosed and is poisonous to cats. For tape worms (caused by swallowing flea eggs you will see either little white worms on their poop or crawling out of their anus kind of look like rice) you must get praziquantel . It is the only drug that kills them and is much more expensive but can also be purchased online.