The following are questions I’ve secretly asked myself about my own dogs. I found the answers through internet research. Here I provide a short answer, and I have provided links where I found the best information should you want further knowledge.
Do dogs have boogers?
My dog has a very long snout so I figured that was the reason I never saw boogers coming out of his nose. In fact, it is rare to see dogs with anything hanging out of their nose unless they are sick. Mucus in a dog can be caused by an infection, allergies and injuries. If your dog has mucus running out of his nose you should bring him to the vet. This is not the same as little bit of watery discharge, which is normal.
http://www.pawster.com/dogs-boogers/
Do dogs dream and have nightmares?
Dogs go through similar sleep stages as humans. Within 20 minutes of falling asleep a dog will often start to twitch, quiver, paw-swim, and even growl. What do they dream about? They often relive the activities they experience during the day. That is, a dog will dream about chasing a ball, or barking at the mailman, or taking a walk with his pal. I assume that a working sheep dog will occasionally dream about a flock of sheep. (I don’t know if he will count them.)
https://www.psychologytoday.com/blog/canine-corner/201010/do-dogs-dream
How often should I trim my dog’s claws?
I was in hospital and afterwards convalescing over several weeks. When I finally felt well enough to get down to the living-room, I noticed that when my dogs walked across the laminate floor their claws made a clicking noise, a sound that can drive me to distraction. As soon as I was feeling up to it, I got out the clippers and trimmed their claws. It’s winter and my dogs don’t get a chance to “file” their claws down on pavement or gravel or rocky surfaces so their claws were quite long.
Some vets recommend you clip a dog’s claws weekly to get him accustomed to the procedure. I find that if I have the luxury of doing it weekly, I rarely need to use the clipper, I just use a file made special for dog claws.
So when should you clip your dog’s claws? When he needs it. Check weekly and try to clip them at least monthly. Pay special attention to the dew claw which can curl back into the dog’s paw.
http://www.preventivevet.com/dogs/how-often-should-you-cut-your-dogs-nails
Can a dog outsmart me?
I always thought I’d love to have a border collie. It seems that they are more than well represented at obedience trials and show trials. However, I have spoken to a number of border collie owners and some have actually told me that they would never own another one. When I asked why, they said, “Because he outsmarts me.” And I thought, “Oh come on.”
But research proves it. If you don’t stimulate your smart dog’s brain, he will outsmart you. And that means that he will likely do so in destructive ways like collaborating with the cat to get food off the cupboard—this happened to me with a Labrador Retriever. Just check these dog shaming pictures. I think you will see that smart dogs are well represented.
This is my dog’s shaming picture.

And the following site will give you a list of the most intelligent dogs.
https://www.caninejournal.com/most-intelligent-dogs/
Should I get a breed dog or a mutt?
I have had both and can tell you that either can be a great pet. People who get a breed dog may want to enter it in breed competitions. But there are other reasons to get a dog with a pedigree.
You should get a breed dog if you want a certain height or strength or personality. For instance, if you are looking for a dog that loves winter and might haul your child in a sleigh, you will probably be looking at a Husky or even a St. Barnard.
But keep in mind that there are never any guarantees. I like Shelties because they are not high enough to reach the table (and steal food) or strong enough to overwhelm me on a walk, but they are a hardy enough to go hiking– which happens to be my favourite pastime. However, I had one Sheltie that was such a slow walker I had to wait up for him all the time on open trails. This same dog would run through the woods when I took him hiking on trails through forests. So, much to my disappointment, I ended up leaving him at home when I went for a hike. To be fair, I also had a mutt who would take off when he was hiking and then “sneak” back. He looked exactly like a coyote so this was quite an annoying habit. Seeing a coyote-like animal coming at you at a slow, determined pace through the trees can make the hair on the back of your neck stand straight up.
All the other dogs I’ve had were perfect companions, stayed by my side, and never wandered off.
Here is a breed finder that may help you decide if you want a certain pedigree.