Experienced and professional animal trainer provide their insights in answering this question :
A. It shouldn’t be very dangerous if the other dog is not much bigger than your terrier. watch your dog for signs of toxicosis ( vomiting, diarrhoea – single incident is a normal reaction; tremors, panting) If anything will concern you see a vet)

How to Identify Common Pet Problems ?

Our sources include academic articles, blog posts, and personal essays from experienced pet care professionals :

Warnings: Not for human use. Keep this and all drugs out of the reach of children. Serious adverse reactions have been reported following concomitant extra-label use of ivermectin with spinosad alone, a component of TRIFEXIS (see ADVERSE REACTIONS).
Symptoms of an overdose of Trifexis® are very similar to the listed side effects above, with vomiting as the most common sign of an overdose. Additional symptoms may include drooling, tremors, fatigue (lethargy), and coughing.
In general, an accidental dose of a pet`s heartworm med is not expected to cause serious symptoms in a healthy individual. Side effects may include rash, headache, dizziness, stomach upset, diarrhea, and a mildly rapid heart rate.
Many different drugs can cause poisoning in dogs when they are not given as prescribed. This is especially true of medications that were intended for humans. Veterinarians define medication overdose in dogs as drug poisoning. Depending on the drug and the amount ingested, this can cause serious illness and even death.
Fatal adverse reactions were blamed on the flea control medication, but when properly administered, Trifexis is safe for dogs. Trifexis has been approved by the U.S. Food and Drug Administration as a prescription medication for dogs to treat flea infestations.
Since it can be difficult to differentiate between what is proven data and what is anecdotal, we want you to know that to date, there has been no confirmed link to any deaths caused directly by Trifexis.
Some toxins cause reactions right away, while others cause symptoms several hours or days later. For instance, the first symptoms of antifreeze poisoning can appear in as little as 30 minutes, whereas the symptoms of chocolate poisoning take between 6 and 12 hours to show up.
Symptoms caused by swallowed poisons can include: vomiting, diarrhoea, agitation and heart issues. Inhaled toxins may cause breathing difficulties or loss of consciousness in dogs. If your dog`s skin comes in contact with a poisonous substance typical symptoms include irritation and pain.
Poison Control

Consider using hydrogen peroxide (one teaspoon per five pounds of body weight), to induce vomiting. Dr. Putter advises using hydrogen peroxide (which is a gastric irritant) under consultation with animal poison control.

Most patients with ivermectin toxicosis respond well to supportive care and return to normal within 48 to 72 hours. Resolution may be more rapid in patients treated with ILE therapy. This expert answer was provided by Jennifer L. Garcia, DVM, DACVIM, Sugar Land Veterinary Specialists, Houston, Texas.
Topping our Top 10 list are common household medications called non-steroidal anti-inflammatories (NSAIDs), which include common names such as ibuprofen (e.g., Advil and some types of Motrin) and naproxen (Aleve). While these medications are safe for people, even one or two pills can cause serious harm to a pet.
The most common clinical signs of opioid overdose include: • drowsiness • difficulty standing • failure to respond to commands • a blank stare, and • weakness, progressing to unconsciousness • inability to breathe and ultimately death. Most canines start to show clinical signs within 15 minutes of exposure.
Trifexis is effective for 30 days of protection against infestation. It protects against heartworm and intestinal parasites, and it treats and controls adult hookworm, roundworm, and whipworm infections.
Give Trifexis chewable tablets once a month with food. Trifexis chewable tablets may be chewed, offered in food, or administered like other tablet medications. If vomiting occurs within 1 hour of administration, redose your pet with another full dose.
Trifexis is a prescription medication. The manufacturer claims Trifexis is safe for dogs that are at least 8 weeks old.
No. Milk is unlikely to be helpful in the vast majority of poisoning situations and can sometimes make things worse. Most pets are lactose intolerant and giving milk can cause or worsen stomach upset symptoms.
Diagnosing toxicity in your pet is often difficult. Tests that help make specific diagnoses are: blood tests, tissue samples for histopathology, and X-rays. When sending blood and tissue to the laboratory, the veterinarian asks for a specific test because there is no blanket test that identifies toxins.
If your pet has ingested a poison, try to rinse or wipe out the mouth with a damp towel/flannel. Do not give your pet anything to eat or drink before speaking with the Animal Poisons Helpline or a vet.
After taking the dewormer, the medicine will begin to be absorbed and take effect immediately, but it may take a few days for the drug to “infiltrate” and kill all the worms. In case you are prescribed deworming by your doctor, use the correct dose and use it for the time as directed.
Oral deworming meds stay in your dog`s body for a few hours only. A follow-up dose is needed usually within two weeks, otherwise the worms may return.
In these cases, the excessive ivermectin from overdose begins to interfere with the dog`s own nervous system and can cause life-threatening symptoms, such as seizures and coma, and can even lead to death. Ivermectin toxicity is considered a medical emergency.
There is no treatment for the poisoning; supportive measures are the only care available (though in cases of oral administration induction of vomiting and administration of activated charcoal often occur ). Early and aggressive supportive care allows for a good prognosis for recovery.
If your pet has ingested an inappropriately high dose of amoxicillin, contact your veterinarian immediately. Your veterinarian may instruct you to induce vomiting, however, do not induce vomiting unless instructed to. Animals showing gastrointestinal signs should be taken to your veterinarian.

Relevant Questions and Answers :

the most relevant questions and answers related to your specific issue

Q. My 17 Terrier ate his Trifexis tablet and then ingested one spit out by his 110 brother rott. How serious is this and what should I do?
ANSWER : A. It shouldn’t be very dangerous if the other dog is not much bigger than your terrier. watch your dog for signs of toxicosis ( vomiting, diarrhoea – single incident is a normal reaction; tremors, panting) If anything will concern you see a vet)

Read Full Q/A … : Vetinfo

Q. My dad lost one of his meloxicam tablets 7.5 mg. I am not sure if one of my 2 dogs found it and ate it ( 9 lbs each) how can I know if they did?
ANSWER : A. if one of your dog ate the tablet it is likely that he/she will show signs of intoxication which can be very serious (stomach ulceration, kidney failure). If there is a chance that he/she did eat the tablet you should take both your dogs to your vets and treat both with intravenous fluids and gastropretectants.

Q. 16 lb. Tabby, very large, not fat. 8 years old ate one 2,000 I.U. D-3 Vitamin D soft gel capsule one hour ago. Ate dinner 10 minutes later. How toxic?
ANSWER : A. Vomiting, muscle twitching and weakness, increased thirst and urination, kidney damage and seizures can all develop with excess vitamin d levels. Vitamin D is stored well in the body so any that is ingested is added to the natural reserve and it is the total body level rather than the new dose which will determine any problems.

The toxic level is expected to be 0.1mg/kg; 2000iu is approximately 0.05mg so your cat would be estimated to have ingested 0.007mg/kg extra with this tablet. Monitor very closely for any signs of illness or discomfort and a blood test to rule out kidney complications may be advisable especially if there is any chance she could regularly help herself

Q. Which common foods are poisonous to pets?
ANSWER : A. That’s a great question. As responsible pet owners we need to be aware of food items that can be harmful to our canine or feline companions. Here are some of the most common foods proven to cause illness in our animals at home:

Chocolate: A favorite and irresistible treat amongst most humans, chocolate is considered toxic to dogs. In very small amounts it is usually not a huge issue, but with larger volumes and with darker chocolates pet owners should be concerned. Chocolate contains methylxanthine theobromine, which is similar to caffeine. Chocolate ingestion can cause vomiting, diarrhea, hyperactivity, issues with normal heartbeats, seizures, and in some severe cases, death. It is best to keep your favorite chocolate treats in a good hiding spot and out of reach of your dog or cat.

Grapes and raisins: Dogs should not consume grapes and raisins because of the risk of acute kidney failure. Most dogs experiencing grape or raisin toxicity will begin to have vomiting and/or diarrhea within 6-12 hours of ingestion. Other abnormal clinical signs include lethargy, abdominal pain, dehydration, and tremors. Kidney failure develops within 24-72 hours of the initial ingestion. There are some dogs that do not experience these devastating side effects. It is best to contact your veterinarian or veterinary emergency facility if you believe your pet has ingested grapes or raisins.

Garlic and onions: We often forget that our meals contain these two popular ingredients and will allow our furry companions a few bites or licks. Onion and garlic both can cause a type of poisoning that results in damage to red blood cells, making them more likely to rupture. They can also cause stomach upset and mouth irritation. Look for pale gums, increased breathing or drooling or any vomiting or diarrhea.

Bread dough: Unbaked bread dough is considered poisonous to our pets. The bread dough, when ingested, expands in the stomach because of the warm and moist environment. This can lead to a bloated or even twisted stomach. In addition yeast is often added to our baking products to help get bread to rise, and when this yeast is fermented it produces both carbon dioxide and alcohol. The alcohol produced can be absorbed into the bloodstream and causes dangerous drops in blood sugar, blood pressure and body temperature. Common clinical signs include vomiting or retching, distension of the stomach, weakness and collapse.

Macadamia nuts: Ingestion of these nuts are not proven to be fatal in dogs but can cause them to experience uncomfortable clinical sings, including fever, joint stiffness, vomiting, tremors and difficulty walking, especially in their hind legs. Often your pet will start to feel better after about 48 hours, but supportive veterinary care (such as pain medication) may help ease their discomfort.

Xylitol: The most common ingredient used in sugar-free gum is xylitol, which is a non-caloric sweetener. It is also found in some oral rinses, toothpastes and vitamins. Xylitol and dogs do not mix – it can cause a dangerous drop in blood sugars levels. Dogs will often display signs of disorientation, black tarry stool, tremors and seizures. If severe enough some dogs have developed liver failure. Keep your gum away from your canine companion.

Avocados: Avocados are not actually poisonous to dogs or cats but as many veterinarians can tell you the avocado pits can cause a foreign body obstruction. Avocados contain persin, which is actually toxic to the majority of pet birds. The abnormal clinical signs associated with avocado ingestion in birds include, respiratory distress, inability to perch, liver and kidney failure and sudden death.

Go forth and enjoy your favorite foods, but keep in mind which foods you should avoid sharing with your furry family members. Whenever in doubt, contact your veterinarian for healthy and safe food suggestions.

Q. My dog or dogs ate some chocolate while I was gone. Not sure if both ate or just one. I’m guessing about 4 oz. of milk chocolate were digested. Help!
ANSWER : A. It would be helpful to know the weight of your dogs. Milk chocolate is much less toxic than darker types and 4oz among more than one terrier would be expected to have mild-moderate side effects. If it was within the last hour it may be helpful to arrange to have the dogs to vomit any which may be still in their stomachs but if it has been greater than 3-4hours this will not help. Monitor closely for any signs of tremors, agitation or confusion which would require urgent treatment, some mild vomiting or diarrhea would be expected.

Q. My dog ate 2 candy bars, a Snickers and M&Ms. Is this toxic? He is a 13.4 lbs Chorckie. He drank water and ate some carrots too
ANSWER : A. Chocolate is toxic to dogs. Dark chocolate is usually more harmful than milk chocolate products, as the cocoa content (which is the toxic part) is higher, however any chocolate product if eaten in a high enough amount can be harmful.

It is best to contact your local veterinarian or emergency clinic for care if your dog has ingested chocolate. If the ingestion was recent, your vet may recommend inducing vomiting and can give you instructions unique to your dog for care. If the ingestion was not recent, your vet may recommend bringing your dog in for care, or monitoring for signs of toxicity such as vomiting, diarrhea, lethargy, abdominal pain or changes in behavior or appetite.

Q. My dog 1 year old Jack Russell miniature pincer mix. He ate one green grape what should I do?
ANSWER : A. The skin of grapes can be toxic to dogs, but the likelihood that only one grape will cause a problem is very low. Watch your pet for signs of toxicity (vomiting, not eating, listless) for the next 1-3 days. Mess your veterinarian if she shows signs of illness, but the ingestion of only one grape is not likely to cause a toxicity.

Q. My dog is a lab. 12 years old and in great health. He has started to lick and swallow pebbles in my back patio area. Can you give me advise. I juse
ANSWER : A. There are two theories one being the dog is lacking minerals and the other is behavioral some dogs will lick and swallow rocks when they’re bored or anxious. So what do you do? Start by ruling out something medical by having him examined by your vet. If its determined he’s healthy and it might be behavioral then you can address the behavioral issue by giving the dog more attention, exercise, etc I would be more than happy to trouble shoot this issue with you through a private consult.

Until you determine what the cause is I would not leave your dog unsupervised where he can ingest pebbles or other foreign objects. If you must leave the house you can consider kenneling (if you’re not already doing so), When you’re out for a walk or break keep a close eye that he does not ingest rocks, ingesting them is very dangerous and might require surgery to remove them.

This type of issue is best addressed through a private consult. There can be several other reasons why your dog is eating pebbles,what I wrote above is just the most common (not saying they apply to your dog) a private consult we will do a Q&A and get to the bottom of this.

Thank you