Nermal the cat from Garfield. Nermal was the world's cutest kitty cat that would annoy Garfield. The second (and bigger) influence was Sylvester Jr. from the Looney Tunes cartoons. I loved the dysfunctional relationship that Sylvester the cat & Sylvester Jr. had and I tried to capture that with Slick & Slick Jr.
Slick Jr. created continuity problems. One problem was that Slick Jr. didn't live with Slick. He would only occasionally visit. I never explained this. The way I see it, Slick Jr. was owned by someone else (maybe an unseen friend or relative of Jake) which would explain his occasional appearances. Also, who is Slick Jr.'s mother? I never made any references to Slick having a "wife." Wouldn't his girlfriend, Baby, want to know who Slick Jr.'s mom is? Wouldn't Slick Jr. want to know? It never came up. Maybe one day I'll solve this mystery.
Note: This comic is bizarre. A father crushing his son to death is just a little twisted. I was a weird kid.