Experienced and professional animal trainer provide their insights in answering this question :
A. Tylenol is actually toxic to dogs and cats and should never be given. If your dog is experiencing pain, I would recommend that you call your vet’s office and they can suggest some pet friendly pain medication.

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For dogs, 5 to 7.5 mg per pound (10 to 15 mg/kg), two to three times a day is recommended. If given for more than 5 days, two times a day is recommended.
Many pain medications considered safe for people can be toxic or even fatal for dogs. Never give your dog aspirin, ibuprofen (Advil), acetaminophen (Tylenol), or any other medication designed for humans without first consulting your vet.
The maximum daily dose is four grams (4,000 mg). Regular Strength tablets (325 mg each): One to two tablets every four to six hours to a maximum of 12 tablets per day. Extra Strength tablets (500 mg each): One to two tablets every four to six hours to a maximum of eight tablets per day.
The dosage of acetaminophen is 15 mg per kg of body weight, which is about 7 mg per pound.
For dogs and cats, acetaminophen (Tylenol) is toxic (poisonous or deadly)! Relatively small doses (a single pill or even a small piece of a pill) can be toxic or deadly to any animal species (cats, dogs, ferrets, birds, pigs, primates, and many others).
Acetaminophen, a common human drug used to control pain and fever, is toxic in dogs.
Veterinarians will often prescribe non-steroidal anti-inflammatory drugs, or NSAIDs, for pain in dogs, according to rover.com. NSAIDs can help reduce swelling, stiffness and joint pain in dogs. According to rover.com, common NSAIDs used for dog pain include: Rimadyl.
Apply heat and ice (alternately) to the injured leg. This treatment is just like what you would do if you injured yourself. The ice can help reduce inflammation and swelling while the heat can help with stiffness and discomfort.
As you may have guessed from the descriptions above, acetaminophen is best used for fever, aches and pains, but will not be very helpful if the pain is due to inflammation. Ibuprofen is more helpful for these symptoms when inflammation is the cause.
It usually takes around 45 minutes for oral tablets and extended-release tablets to start working when taken on an empty stomach. Oral disintegrating tablets and oral Tylenol liquid start to work in about 20 minutes, while the intravenous acetaminophen takes five to 10 minutes to have an effect.
For acetaminophen, that is about 5 to 10 mg for every pound of body weight up to a maximum single dose of 1000 mg for people over 200 pounds. There is no increase in effect at higher doses — only greater risk of toxicity.
Children—Dose is based on the child`s age, do not administer the over-the-counter products to children under the age of 2 unless directed to do so by your doctor: Children 11 to 12 years of age: 320 to 480 mg every 4 hours as needed. Children 9 to 11 years of age: 320 to 400 mg every 4 hours as needed.
As a result, something that`s safe for humans to ingest can lead to toxicity or death in animals. Acetaminophen is one of those cases. For dogs, a toxic dose is 45 milligrams of acetaminophen per pound of body weight, while the toxic dose for cats is smaller at 22 milligrams per pound of body weight.
“Paracetamol is licensed in dogs as Pardale V for 5 days. The dose in Pardale V works out at 33mg of paracetamol for every kg of body weight, three times daily. The listed dose in most vet formularies is 10mg/kg twice to three times daily,” Nick explains.
For dogs, ibuprofen can easily exceed toxic levels. Ibuprofen has a narrow margin of safety in dogs. Signs of toxicosis can occur when as little as half a 200 mg pill is given to a 25 pound dog. The most common cause of ibuprofen toxicity is a well-meaning owner trying to alleviate pain in his dog.
Do not exceed 9 mg/lb on any day. Example: A 60 lb dog could be given around 400 mg of acetaminophen per dose, or half of one Tylenol No. 4 tablet.
What are the signs of acetaminophen toxicity in cats? Signs of toxicity from acetaminophen may develop within 1–4 hours of ingestion. These cats will experience a progressive depression, and they may develop rapid breathing. They may experience abdominal pain and nausea, causing drooling.
Common medications used in the management of pain related to dog limping include the NSAID family of drugs (non-steroid anti-inflammatory drugs) such as carprofen, meloxicam, firocoxib, and deracoxib.
Treatment for Mild Cases of Dog Limping

Veterinarians often prescribe nonsteroidal anti-inflammatories for mild to moderate pain, such as: Carprofen. Deracoxib. Etodolac.

It is dangerous to allow a dog`s broken leg to heal untreated or without the supervision of a veterinarian. While a broken bone does naturally heal on its own (through bone remodeling), that does not mean it will heal properly.
In general, the oral forms of Tylenol take up to 45 minutes to start working. But the effervescent (dissolving) tablets may work faster — they take about 20 minutes. However, specific timeframes may vary from person to person.
Acetaminophen (Tylenol and other brands) is usually effective for mild pain and is easy on the stomach. However, it is toxic to the liver at high doses. The recommended maximum per day is generally set at 4 grams (4,000 milligrams), which is the equivalent of eight extra-strength Tylenol tablets.
With Extra Strength Tylenol, patients can take 2 pills (each of which contains 500 mg of acetaminophen) every 4 to 6 hours; however, they should not take more than 8 pills in a 24-hour period.
You should only take 1-2 pills of 500-mg Tylenol or acetaminophen at a time and no more than 6 pills in a 24-hour period. The maximum daily dose of Tylenol for a healthy adult who weighs at least 150 pounds is 4,000 mg.

Relevant Questions and Answers :

the most relevant questions and answers related to your specific issue

Q. hurt his leg while running today, weighs 120 lbs. How much tylenol can I give him?
ANSWER : A. Tylenol is actually toxic to dogs and cats and should never be given. If your dog is experiencing pain, I would recommend that you call your vet’s office and they can suggest some pet friendly pain medication.

Q. How much should I feed my cat?
ANSWER : A. How much a cat should eat depends on many variables including his activity level, metabolic rate and the food you are offering. Use the feeding guide on the cat food label as a starting point. These instructions usually read something like, “for cats weighing 5 lbs, feed between 1/2 and 3/4 cup per day; for cat’s weighing 10 lbs, feed between 3/4 and 1 cup per day; and for cats weighing 15 lbs, feed between 1 cup and 1 1/2 cups per day”.

Use your cat’s body condition to fine tune the amount you offer. For example, if he is overweight offer an amount on the low end of the recommended range and reevaluate in a few weeks to a month. Your veterinarian can also help you determine how much of a particular food you should be offering.

Q. I have two dogs 9.5 lbs and 10.5 lbs. The flea and tick med. Weights on the meds are 4 to 10 lbs. Or 11 to 20 lbs. What do I give the 10.5 lb. Dog?
ANSWER : A. Give the drug for 11-20ib. It’s better to give a little too many than too less ( because there is a risk that drug won’t be efficient ) you can also give 11-20ib drops without a few drops to adjust the dose to the body mass

Q. My 5 year old Dachshund has broken his rear leg. A trip to the vet is impossible for two more days (rural area), can I give him something for pain?
ANSWER : A. If your dog has a broken leg, then veterinary care is a must. If you can get into contact with your local vet before seeing him or her, they may be able to give you information on an OTC pain medication that could be safe to give dogs. Do not attempt to give any medications without first consulting your vet as many pain meds can cause kidney/liver failure or stomach ulceration if given to dogs. In the meantime, keep your dog on strict kennel or bed rest and only taking him out for short potty breaks is best to keep pain down and from letting the leg get further injured.

Q. German short hair 37 lbs was running full speed and hit her leg on a big rock. She’s limping and in pain. Far from vet. Can I give her aspirin?
ANSWER : A. Aspirin should not be given unless instructed to do so by your vet. This medication can cause stomach ulceration or organ problems if not given in the correct dosage. If you have a vet you regularly see but cannot get to you may be able to contact them for the correct medication dosage to give for the short-term. You should also try to keep your dog calm and quiet and restrict activity until she can be seen by a vet to help prevent further injury to the leg and facilitate healing. Once you can get to your vet, your vet can examine the leg and provide treatment including a dog-safe pain medication.

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Q. Does ice or ice water hurt a dog?
ANSWER : A. Ice water and ice do not hurt a dog on their own.. however, when your dog is hot/overheating/panting heavily/obviously too warm, giving them ice or ice water constricts their blood vessels and can actually cause them to overheat. It’s very dangerous to give them ice water when they are suffering from heatstroke, or generally panting/hot. You should only give it to them when they’re not panting/relaxed on a warm/cool day. It’s okay to give it to them on a hot day, just be sure they are not too hot themselves before you give it to them.

Q. Can I give my dogs Pepcid for their itching. I know it’s a h2 blocker. My dogs weigh 45lbs. How much could I give them. Thanks in advance!
ANSWER : A. No. I would recommend seeing a veterinarian to figure out why there is itching. If you think it’s allergies if could be from the environment or more commonly from the food. Ask your vet about switching your dog to an all duck basic kibble/can diet or a vegetarian kibble/can diet. You must make sure that you do not give anything else but their specific food or else you’ll still see allergic reactions. Call your vet and ask if you can give benadryl and what type of dosage would be appropriate for your dog.

Q. My dog hurt her neck while playing and she is whining everytime she moves she is a Lab and weighs about 60 pounds. How much tynelol can I give her?
ANSWER : A. I wouldn’t give any Tylenol as it has a very narrow toxic range and if there is any kidney or liver impairment then it can cause serious damage. See how she is after a couple of hours, if it is no better or worse then you should see your vet to get appropriate animal pain relief.

Read Full Q/A … : Vetinfo