Experienced and professional animal trainer provide their insights in answering this question :
A. Never to use Aspirin or Ibuprofen, Both are really toxic for dogs and can cause from a mild gastritis to a severe hemorrhagic gastroenteritis/ulcer with fatal ending. Please go to your vets and if that’s not possible a low dose of Paracetamol.

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Do not give your dog ibuprofen or acetaminophen. There are some NSAIDs just for dogs: Carprofen (Novox or Rimadyl) Deracoxib (Deramaxx)
Tylenol can, in rare instances, be safely used in dogs; however, not only must the dose be carefully calculated by a veterinarian, but the dog`s bloodwork requires frequent evaluation to ensure that no long term damage is occurring.
The short answer is no. While your vet may prescribe aspirin to help your dog when they`re in pain, you should not give them the same medication you have in your cabinet. Medicines like ibuprofen and naproxen can be toxic to dogs, even in small doses.
Why Do Vets Prescribe Aspirin for Dogs? Vets usually prescribe aspirin for dogs with osteoarthritis or musculoskeletal inflammation. The anti-inflammatory properties of aspirin help reduce the pain and inflammation associated with these conditions and can offer your dog relief from symptoms.
Nonsteroidal anti-inflammatory drugs (NSAIDs), such as Ibuprofen or Aleve for humans, are one of the most common remedies your veterinarian may recommend for your dog`s discomfort. These medications can help your dog with pain, inflammation, stiffness, and any other joint issues.
Ibuprofen is toxic to dogs and you should never give it to your pup. Just three to six ibuprofen capsules can be deadly for dogs, so keep the medicine in a safe place. There are canine-specific pain relievers that you can get from your vet or try natural options.
“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.
There are two sizes of aspirin available for use in dogs, adult aspirin (325 mg) and low dose aspirin (81 mg). It is recommended to give buffered aspirin if possible. 1 baby aspiring/ 10 pounds body weight given every 12 hours.
Over-the-counter (OTC) nonsteroidal anti-inflammatory drugs (NSAIDs) for humans, such as aspirin, ibuprofen, and naproxen, can be toxic to dogs. Giving your dog these medicines can cause side effects such as gastrointestinal (GI) ulcers, severe bleeding, and even kidney or liver failure.
The most common side effect of aspirin/salicylate exposure is gastrointestinal irritation and ulceration (bleeding into the stomach/intestines). Additional signs related to the gastrointestinal tract such as a decreased appetite, abdominal pain, vomiting (possibly with blood), diarrhea, and dark tarry stools can occur.
Aspirin is given by mouth in the form of a tablet, preferably an enteric-coated tablet. Give with food. This medication should take effect within 1 to 2 hours; however, effects may not be visibly obvious and therefore laboratory tests may need to be done to evaluate if this medication is working.
If you are worried that your dog ate ibuprofen, you should take them to a veterinarian immediately. Ibuprofen toxicity in dogs can cause serious damage to the kidneys, so time is of the essence if you think your dog has gotten ahold of the medication.
Although relatively safe in humans, ibuprofen and other NSAIDs can be extremely harmful to dogs. Poisoning may happen when pets get into the owner`s medications. In some cases, owners may administer ibuprofen to treat their pet`s pain prior to consulting a veterinarian.
Nonsteroidal anti-inflammatory drugs (NSAIDs) are commonly used to control pain and inflammation in dogs. NSAIDs help many dogs lead more comfortable lives, but these drugs should be used carefully because they all can cause side effects, some of which can be serious.
PYROFINE is handy at times when a veterinarian cannot be approached during odd hours and the pet is suffering from a fever of unknown etiology.
Paracetamol is a very popular painkiller in humans, however it can be toxic or fatal in small animals. Dogs are less sensitive to paracetamol than cats. A 20kg dog would need to ingest over seven 500mg tablets in order to suffer toxic effects. In cats, one 250mg paracetamol tablet could be fatal.
A mild case of paracetamol poisoning can give your dog an upset stomach, and they may appear to be tired. Other symptoms can include laboured breathing, swelling on the face, neck or limbs, gums turning brownish-grey and jaundice. More serious cases can include signs of staggering, vomiting and restlessness.
Paracetamol can be toxic to dogs in high doses. Dogs can safely consume 15mg of paracetamol per kilogram of their bodyweight, however any dose greater than this can make them sick. A single tablet of human paracetamol contains 500mg, so it certainly isn`t safe for your dog to eat.
Massive doses at or around 400 mg/kg can cause seizures and coma. Some of the most common dangers and toxicities associated with ibuprofen ingestion in dogs include: Gastrointestinal ulceration (stomach ulcers) Kidney damage and kidney failure (renal failure)
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 short answer is no. While your vet may prescribe aspirin to help your dog when they`re in pain, you should not give them the same medication you have in your cabinet. Medicines like ibuprofen and naproxen can be toxic to dogs, even in small doses.
Elimination of the toxins is essential to the full recovery of your pet. With normal use, aspirin is eliminated from the body in approximately seven hours. With an acute toxicity, a hospital stay of two to several days may be required to monitor your pet`s recovery.

Relevant Questions and Answers :

the most relevant questions and answers related to your specific issue

Q. Shiba Inu. He periodically shakes and trembles, usually unrpovoked and seeming for no reason. Usually cuddling helps but not always. Becomes reclusive
ANSWER : A. I do find that Shiba Inu’s are a really sensitive breed. I think the first thing to rule out is pain. That could be pain from a muscle injury or even gastrointestinal pain. Try to pinpoint whether it occurs after a meal or not. He might be painful due to something going on in his GI tract, and the pain is at its worse after he eats.

I’ve also seen a lot of small breeds like Shibas get back pain, and shaking can definitely accompany that as well. If you haven’t see your vet who can perform a good physical exam and look for any signs of muscular pain along the spine or elsewhere. It’s not a bad idea at this point to consider doing some blood work just to screen for any problems that could be affecting organ function, for example.

If he’s healthy otherwise, I think it’s likely that there’s something that’s scaring him at home. These things can be really difficult to identify, and you have to be really aware and note exactly when the shaking occurs, how long it lasts, etc, and look for patterns. Dogs can hear things we can’t, and he may be hearing things you’re missing, and the noise is disturbing to him. Cuddling is a good idea, also working to distract him and desensitize him with toys and treats might help. But like I said above – definitely rule out pain first.

Q. My dog has hip problems. Can I give him Aleve or other aspirin to help with the pain?
ANSWER : A. Do NOT give your dog over the counter pain medications such as Aleve, Ibuprofen or Aspirin unless specifically instructed by your vet. These medications can cause serious problems such as ulceration of the stomach, or kidney/liver dysfunction if given in the wrong dosage or too often.

If your dog is experiencing painful hips, your vet can provide you with pain medications that are designed for use in dogs. These medications are much safer to give and have fewer side effects. Additionally, supplements with glucosamine and chondroitin may help to relieve pain and soreness associated with hip problems.

Q. My chiweenie is in some pain can she has some aspirin or ibuprofen?
ANSWER : A. Never to use Aspirin or Ibuprofen, Both are really toxic for dogs and can cause from a mild gastritis to a severe hemorrhagic gastroenteritis/ulcer with fatal ending. Please go to your vets and if that’s not possible a low dose of Paracetamol.

Q. I have an 11 yr old dog with diabetes and is now blind. What can I give her for pain though she shows no sign of discomfort. Vet recommends pain pills
ANSWER : A. Diabetes is not considered to be a painful condition. If your dog doesn’t show any signs of pain he will not necessarily need pain medications.

Read Full Q/A … : Leerburg

Q. My 13 yr old male indoor cat displays tenderness to touch in his sides/haunches and it is increasing. Recently put him on diet for arthritis.
ANSWER : A. While tenderness in the back and hips can indicate arthritis pain, it can also sometimes indicate pain internally such as stomach or other organ issues. Cats and other pets will often stiffen their backs to protect the abdomen when in pain. If the pain continues or your cat is still in pain with arthritis treatment it is best to schedule a checkup with your vet to make sure there is not another source for the issue.

Read Full Q/A … : Vetinfo

Q. My dog has hip and leg pain. Arthritis. Can I give him acetaminophen or ibuprofen? If so, how much. He weighs 80-100 pounds
ANSWER : A. Advil or Ibuprofen is highly toxic to dogs and cats and should never be given. Tylenol is another medication that is toxic. Human medications should never be a first resort. 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. My female dog has tumors on breast and has an acl tore took her to the vet but has made no improvents n doesnt want eat or still dosnt want to walk
ANSWER : A. Mammary tumors should be surgically removed. An ACL tear is usually also a surgical repair. If you have opted to not have the surgeries, then palliative care is the choice, ie NSAIDs against inflammation and pain, and pain medication. Sometimes these pain medications or pain alone can cause the dog not to eat. You need to check back with your veterinarian and discuss pain medication for your dog.

Read Full Q/A … :

Q. Can my female Boxer take ibuprofen or aspirn for hip arthritis pain?
ANSWER : A. I would not recommend giving your dog ibuprofen because it can cause toxicity in animals. Aspirin has also been shown to cause gastric ulceration in animals. I would recommend consulting with your veterinarian in regards to treating the arthritis with a non-steroidal anti-inflammatory, such as Rimadyl. There are also joint supplements for dogs that contain glucosamine and chondroitin to promote healthy joints, such as a product called Dasuquin.

For information in regards to ibuprofen toxicity you can visit:
http://www.petmd.com/dog/conditions/poisoning-toxicity/c_dg_ibuprofen_advil_poisoning_in_dogs