Ben 10

 Ben 10 is a show about a boy named Ben. He gets a watch looking thing, the Omnitrix, which allows him to transform into many aliens.

Wildmutt is a dog-like alien. It has something on its arm. 

Cannonbolt is a bowling ball I think.

Spitter is one of the most forgettable alien I know. Or the most forgettable. At least, it's forgettable.

Echo Echo is one of the ones who were introduced in the second series.

Eatle is a black colored alien with a little bit of silver on it.