Jeff (the shark dog or sharkdog)

Like a shark but instead of hair it has shark skin, it is very small, it has a dorsal fin, instead of a tail it has the back fin of a shark, it has the teeth and bones of a shark on its face with a necklace that says "Jeff" and Deadpool's phone number in case Jeff gets lost, it has 2 rows of teeth, some very sharp front ones and others smaller but equally sharp, some gills on the side of its head

Jeff is very playful, very funny, very active, he loves to eat meat of any kind (Fish, Chicken, Beef, Human), his favorite meat is fish, more specifically he loves tuna, he loves to gently bite his owners (it's his way of expressing his love), he is brave, he hates the sounds of cokes or explosives, he loves to play with things like balls or chewable dog toys (but he breaks them in a matter of seconds), he likes to go for walks and hunt pigeons, he likes to swim and eat tuna

He can breathe in and out of water, he is very fast, his sense of smell is better than that of any sniffer dog, his skin is very resistant to the point where bullet shots do not damage it too much, his teeth crush almost anything (he cannot gnaw on Bibranium, Admantium and Titanium), he is an excellent swimmer, he can potentially heal people, he can spit water like a high-pressure hose.

He likes to bite Deadpool's butt for no apparent reason, when he does something wrong he makes puppy eyes to hope he doesn't get punished, he likes to do harmless pranks, this thing is literally the purest soul in the fucking universe