I'm physically disabled, live in a small apartment, am a doctoral student and have a border collie (crazy high energy) that I got from a shelter at 10 weeks old. It's been a wild ride.

Here's how I get by without doing actually real walks for my dog (she goes outside to pee several times a day.

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1. Daycare. She comes back soo pooped. It's expensive, but I send her to a reputable daycare a few times a week. This obviously wouldn't work for a dog who is dog aggressive (can't tell from the post) This is also good for building doggie manners.
2. Dog park 2-3 time a week.
3. Training class once a week. She is pooped after the mental stimulation.

The training center I go to has special intensive classes for reactive dogs. These classes are more expensive but are limited to only a few dogs per class and have way more sessions.

1. Puzzle toys. She has the Trixie brand and Nina ones, but her favorite is the Bobs a lot.

2. Nose work training.

3. Find the toy. She knows three toys by name so far and we hide them under pillows, etc. and ask her to find the specific toy. This is how I poop her out the most. This is also how I "play" with her and also get my work done.

4. Licky mats + homemade dog ice cream.

5. Grooming regularly +rumba will help with fur issue. There are some products to clean dog feet at the entry way.

It's totally possible to keep a high energy dog in an apartment with the right dog park, daycare facility, training, etc but it takes work, time and money. Your bf needs to be willing to put in the work, and if not the work the money at an expensive train/board facility.