To rephrase Philip's comment:
The choice of lens is a personal one. Personally, I do not like the
Canon EF 50mm f/1.4 USM on APS-C, because shooting at (APS-C) 50mm is uncomfortable to me and I do not like the perspective, color rendition, bokeh, and sharpness it offers me. However, this does not tell you anything useful at all.
Bokeh is a highly subjective matter, while sharpness is a matter of both the copy of the lens you get and scientific measurements. For the first one, you will need sample photos that come close to what you plan to do with the lens (or your own samples), for the second one, a database will do.
Please note that:
Sharpness is the most overrated aspect of lens performance. Lens sharpness seems like it ought to be related to making sharp photos, but it isn't.
© Ken Rockwell, emphasis mine.
That said, let us look at the list of things you like to do with it:
photographs of dogs:
This is a collage of photos of my mother's dogs. They were taken in a bit of a hurry, as my mother wanted me to take them at the spot in our garden. All of the photos were made with my
EOS 5D Mark III and the
Canon EF 24-105mm f/4 L IS USM, as there was no time to time to switch between primes. All of the photos are uncropped
- The upper left one was shot at
92mm @ f/5.6
- The upper right one at
60mm @ f/5.6
- The lower one at
58mm @ f/4.5
As far as I remember, the dogs did not care for the camera too much, but that might have been due to the distance I kept, as close-ups would have needed more time to prepare.
All of them clearly show problems with background separation, which was mostly due to lack of space in the garden.
If we are talking about doggy-sports, a sports lens (e.g. your
70-200mm f/4) would probably be better suited than a wide to normal prime lens.
Again, we would need to know which kind of portraits you want to do.
As questions regarding portrait lenses have been answered here before, I would recommend you to read some of the portrait questions, especially Which focal-length lens is usually used for portrait photography, and why?, which offers some examples of focal lengths for different kinds of portrait photography.
close ups of dogs:
Again, a personal example - It's my mother's late dog from before. This is the closest to a close-up that I ever got. It was shot with my
EOS 5D Mark III and a Tamron
SP AF 70-300mm 4.0-5.6 Di VC USD, set at
154mm @f/8. Again, this was a hasty shot.
As far as I can recall, I first tried to get the shot done with my
Canon EF 100mm 2.8 L Macro IS USM, but failed miserably because the dog was far too distracted by the relatively close camera and I really had to get this shot in a hurry.
None. Your profile might require multiple lenses, not only one.
If you already have a zoom lens, simply go to your photo collection, search for the photos you like the most, get their focal length out of the EXIF metadata - and buy a lens that offers this focal length.
If you start from scratch, it might be best to rent a choice of lenses first to find out which one you like the most. Or perhaps buy a used kit lens to find out, as Lawrence suggests.
As to bokeh: That will depend on the lens, too. As it is a subjective matter, you will have to look for photos made with the lenses in question and/or make your own to properly judge this.
One piece of personal advice, though: If you are not sure about buying the
EF 50mm f/1.4 USM, then an
EF 50mm f/1.8 (STM) might be a good choice, as its performance-price ratio is better and it often has a better re-sell value.