woo, this is rough, lol.
Anyways, here are some tips:
You only drew two legs. It's easy to forget those other two legs, but they're supposed to be there.
Your tail is sticking up at an awkward angle. Animals typically let their tails hang down.
You tail was also really long. It would probably trip on it's own tail a lot.
I don't know what type of head/eyes you were going for, so I just drew a canine head. But no matter what head you use, you should probably draw the top part and the chin separately, if that makes sense.
Eyes are rarely oval. Again, I didn't know what kind of eyes you were trying for, so I drew canine ones. It's best to use a reference for eyes until you get pretty good with them.
Your neck is really narrow at the top.
The back of the neck has fur on it too, so maybe draw that fluffy like you did with the bottom of the neck.
The fur on the chest/belly is a bit funny
Paws have four 'toes.'
Your sketch was really good, and your back legs were pretty good too. You just need a little practice with the other parts ^u^

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