Some breeders report savannahs in excess of 30 pounds, with at least one breeder claiming an over 40 pound male.
Savannahs have been described as friendly, assertive, active, and interested in dogs and children. They are commonly compared to dogs in their loyalty, and they will follow their owners around the house like a canine. They can also be trained to walk on a leash like a dog, and even fetch.
Savannahs often greet people with head-butts, or an unexpected pounce. Some savannahs are reported as being very social and friendly with other cats and dogs, while others may run and hide or revert to hissing and growling when seeing a stranger. Exposure to other people and pets is most likely the key factor in sociability as the savannah kitten grows up.
Owners of savannahs say that they are very impressed with the intelligence of this breed of cat.[citation needed] An often noted trait of the Savannah is its jumping ability. Savannahs are known to jump up on top of doors, refrigerators and high cabinets. Savannahs have been known to get into all sorts of things; they often learn how to open doors and cupboards, and anyone buying a savannah will likely need to take special precautions to prevent the cat from getting into things.
Water isn't a fear of the savannah cat; many will play or even immerse themselves in water.[4] Presenting a water bowl to a savannah may also prove a challenge, as some will promptly begin to "bat" all the water out of the bowl until it is empty, using their front paws.
Vocally, savannahs may either chirp like their serval father, meow like their domestic mother, or do both, sometimes producing sounds which are a mixture of the two. Chirping, when present, is usually observed more often in earlier generations. Savannahs may also "hiss"—a serval-like hiss is quite different from a domestic cat's hiss, sounding more like a very loud snake hiss, and can be alarming to humans not acquainted to such a sound coming from a cat. Hissing, and even aggressive behavior which involves hissing, is usually more frequent in F1 or occasionally F2 generations, and may subside or disappear as the cat is socialized.
Savannahs are illegal to own as pets in the state of New York as of 2005. 
I learn more stuff from you people!! (what a beautiful cat!)