Have had a couple of beagles- not very bright.
I, unfortunately, have a smart beagle...
1. We can teach her new tricks in an hour with food motivation, and she doesn't forget the trick... We made the mistake of making roll over the final trick too often, so she does it automatically now whenever we have food.
2. She learned how to open our cabinets. Luckily she's not big enough to open our fridge.
3. She learned how to operate the childlocks that we installed to prevent her from getting into our cabinets...
4. She understands tone of voice and words better than any dog I've ever had. For instance, if I catch her trying to open the cabinet and say no, she'll immediately stop, leave the kitchen, turn around and grunt/growl at me, then continue on her way. She pretty much does this anytime we tell her to stop doing something... (and we don't use "no" every time).
5. She knows exactly who to kiss up to as she goes to my wife every time.
6. If she gets in a lot of trouble, and I take away her garbage, or whatever item she wasn't supposed to have, she'll go find something of mine and take a leak on it... Once, I yelled at her for getting into the garbage. She came over all apologetic and I rewarded her by letting me jump into my lap... She proceeded to calmly urinate all over me.
7. She watches TV intently. She howls at animals, monsters, or people doing bad things to other people...
8. She figured out how to get onto our counter. She got on a chair, jumped on our table, and then proceed to run and jump 3 feet to get onto our bar height countertop... I have no idea how she didn't slide right off... Luckily this has only happened once.
9. She recognizes all grates and walks around them when we're outside. She also will only pee on manhole covers or grass. Since we're in brooklyn, she pees a lot more on manhole covers...
We'll leave it at that now... My other dog is a border collie/pit bull mix. She's relatively smart (she loves frisbee), but she has the focused one track mind of a pit bull. Mostly with her its a matter of getting her enough exercise so she isn't so wired that she won't pay attention. She's more of a "jock" than an academic.