You've hopefully come across 負ける by now, which means "to lose." So, you can figure out this word means "losing dog." Well, calling someone a dog isn't so nice, so you're probably just calling them a loser.
The readings are kun'yomi, but you should be familiar with 負ける and of course 犬 well enough to learn the reading here.
I'm aware that I'm a loser who loves to just stay home and watch TV all day.
I can't stand the fact that the loser is taking over my job tomorrow.
You are a loser and really creepy!