ok i think this has something to do with their hiaracy (sp) but not sure and it is just really puzzling me.

my elder dog (by 8months) is a terrier type mongrel bitch and she has just started humping my vizsla bitch. both are spayed so i am not sure what it is (other than the joys of spring :) ). any way she did it a year or so ago but it was when the vizsla was coming on heat for the first time but hasn't done it since and my viz is now spayed so it can't be that.

i was just wondering what it was to do with cos it is really strange and has suddenly gone from nothing to nearly every hour or so.

i  am just puzzled
thanks
anna