Uh, question.

Make the wolf a lighter black then the lines.

lighter black lines for the lineart and a normal or dark black colour for the wolf itself

Do a small bit of white between the two blacks to make the lines visible

Panic-- that would make the whole thing look terrible.

When making a black wolf, you should actually never use the pure color black. That makes it look like a shapeless blob, as demonstrated by Venn. Make it a couple shades lighter, make it a dark grey. (it doesn't even have to be that dark! We still get the idea of blackness if you use a medium gray). If you're not going to shade, though, you might want to use a dark grey. But if you start with medium gray and then shade with dark grey or something very close to black, it will end up looking black.

Other members summed this up pretty well, but I rarely ever use pure black or white in art - it's just not natural. Usually a dark grey gets the point across - you could also use a dark cool or warm grey to make it more interesting~

Ah, thank you, everyone! ^^