Are these symptoms genetic or are they caused by external factors like slippery or smooth floors?
I wouldn't call them 'symptoms.' I am by no means expert I am right now myself in the school of hard knocks, but from what I am told it is quite common for puppies to go east westy for some time (one of the reasons you have to be patient and wait for them to grow up to know what they will be like).
I read in a golden book I bought that dogs can also go easty westy as adults if they do to much jumping/running on hard surfaces before the plates fuse--anything that is not good for a puppy to be doing. In that case not genetic.
But improper structure (genetics) will cause these things. But keep in mind no dog is perfect and the show I went today one of the goldens getting second (can't remember the class, wasn't BOB) had some cow-hocks going on and still beat out quite a few other dogs.
Anyway, if I am wrong I hope someone more experienced will correct me! I won't mind