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I would like to help you and your dog with this question, but need a bit more information in order to better assist you.
When did this start - how many hours ago?
How much does Riley weigh?
If you wipe the drool with a white tissue, can you check to see if there is any colour to it?
What you are describing with Riley drooling so profusely is called ptyalism. There are a number of possibilities for what may be causing this. 1. A foreign body - Your dog could have something like a grass awn or a sharp sliver of stick or raw hide penetrating the tissues in his mouth. Grass awns are notorious for getting stuck in tissues as they are barbed and tend to migrate upwards.
I have often found with bone or stick chewers that they have a cut or a foreign body in the soft palate at the back of the mouth. I have had to give an anesthetic to find it usually because it is so far back.
2. A tooth root abscess - Teeth have very long roots that extend close to the nasal sinuses. With a tooth root abscess, the infection can actually get into surrounding muscles and tissues and cause pain and with infection there can be ptyalism. A tooth root abscess is often caused by a fractured tooth, with a slab fracture of the carnassial (big molar at the back) being the most common one I have seen. If your dog will let you look around in there, you may be able to find it. You have to really lift that top lip up and stretch it back to see all the teeth at the back. This may be best done by a vet as your dog may not be wanting a dental exam at the moment!
This is not very likely in such a young dog.
3. Masticatory Muscle Myositis (MMM) is another possibility. With this condition, the muscles in the jaw become very inflamed, making it painful to open the jaw. It is caused by the dog's own immune system attacking the muscles. Here is more about it: http://www.petplace.com/dogs/masticatory-muscle-myositis/page1.aspx This seems unlikely since he is young and you have not reported him to be painful when you checked his gums.
4. Ingestion of something irritating. Dogs that chew on plants containing calcium oxalate crystals will have local irritation and copious drooling. Dieffenbachia species will do this (dumb cane is a house plant in this family, but there are various others).
Milk or other calcium containing products (yogurt, ice cream) can help to relieve the symptoms.
Here is more about this plant: http://en.wikipedia.org/wiki/Dieffenbachia
5. It is possible that your dog got stung by a bee or wasp on his tongue. This might not be visible, but could still cause drooling. With these still-cool temperatures there this would be even more likely as the bees would be more sluggish and easily licked up by an inquisitive pup. Here is more: http://www.petplace.com/dogs/allergic-reaction-to-insect-stings-in-dogs/page1.aspx
If your dog came in to my clinic, I would start with checking his temperature and doing a dental examination. Depending on what I found, I would consider starting him on some Benadryl just in case this is an insect sting, and I would offer milk-products (yogurt, ice cream, cottage cheese are less likely to cause diarrhea than straight milk).
When I have clients phone me after hours about this, for patients that I have seen, I advise the people that they may be able to give their dogs BENADRYL (diphenhydramine). This should not be given if the dog has glaucoma.
I ADVISE OWNERS TO MAKE SURE IT IS PLAIN DIPHENHYDRAMINE WITH NO OTHER INGREDIENTS.
The dose that one generally gives is 1mg/lb.
It comes as 25 mg tablets, and as he is 45lbs, his dose should you choose to use it would be TWO TABLETS. This can be repeated every 8 hours for 24-36h.
Here is more about Benadryl:
You should see improvement within 30 minutes.
Here is more about allergic reactions in dogs:
If this did not help, I would give anti-inflammatories and anti-biotics in case there was a cut in the back of the throat. If he still did not improve, my next step would be to give a very light anesthetic in order to do a retropharyngeal exam and take some dental x-rays and take a biopsy of the chewing muscles if I were concerned about MMM. Here is more about ptyalism: http://www.petplace.com/dogs/ptyalism-hypersalivation-in-dogs/page1.aspx So, if he were my patient, for now I would try milk products and Benadryl.
If this does not help within the hour, then I do suggest a visit to the emergency vet tonight.
This is because of concerns about dehydration. It sounds like he is producing a LOT of drool, and he is going to quickly become dehydrated!
If you absolutely cannot see an ER vet, there are a number of things you can do to increase water consumption.
You can make "hot-dog soup." To do this, take one hot dog and cut it into a dozen small pieces. Put them in 2 cups of water and bring to a boil for 5 minutes. Take off the heat, and allow to cool. Remove the hot dog pieces, and offer the dog the water.
You can mix a bit of food in with water to make a soup - that way your dog may be enticed to drink more.
I suggest opening a can of tuna *in water* and offering the liquid diluted with water 50:50.
Any clear fluids are fine to give - such as apple juice, gatorade, pedialyte. Dilute all of them 50:50 with water.
You could try Lactose Free milk (Lactaid is the Canadian brand).
Other things you can do to encourage a dog to drink are:
- offer water from a very wide flat bowl like a lasagna plate
- If he likes dripping water, leave a tap dripping .
- Offer bottled water and see if he prefers it.
- Offer chicken broth or beef broth, diluted 50:50
- See if he likes water with an ice cube in it.
- See if he likes it out of a cup or pasta bowl.
- You could try getting some human baby food in meat flavours (check that there are no onions or garlic in the ingredients) and mix that with warm water and offer that as a "soup" for her to drink. Beech Nut makes a line of baby food that has nothing but meat (beef, chicken, turkey or veal) in it.
If you cannot find this, you could find another meat baby food - just read the label carefully to be sure there are no onions, onion powder, garlic, or garlic powder in it. See if he will drink this made into a soup.
Cook a chicken breast and put it in the blender with enough water to turn it into baby-food consistency. Make it into a soup.
Hopefully, these ideas will help you to get some fluids into Riley to re-hydrate him.
If Riley develops vomiting, more diarrhea, continued drooling for more than 1 hour, or is becoming weak or having trouble breathing then please go directly to an emergency veterinarian!! If he seems better but not 100% then see your family vet in the morning!
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The above is given for information only. Although I am a licensed veterinarian, I cannot legally prescribe medicines or diagnose your pet's condition without performing a physical exam. If you have concerns about your pet I would strongly advise contacting your regular veterinarian.