Five and a half months ago I took home from a dog refuge a cross-bred Britanny Spaniel to be company for our Border Collie (who at the time was 7 months old). So today the Border is one year old and the Britanny (Jake) is eleven.
Generally, they get on well, and if the young border wants to play too much (he loves chewing the other's ear) the older dog bears his teeth and snarls, and will even chase the younger around the garden to get him stop.
At the beginning, Jake was very quiet and calm, but has opened up and now dashes to me when I get home from work, and will follow me around the garden and all around the house - my wife says that he now lives only for me! Just recently though, he has started to dry hump the Border, and now follows him about like a love-sick suitor! What is strange is that the Border was castrated five months ago.
I know that dry humping can be a sign of dominance, but between the two it has always been the Border who is dominant - for example, if the Border has finished eating and Jake hasn't, the Border just pushes him away and finishes the bowl (in practise either I am there to stop this or one eats outside and the other inside).
So, finally, my question is should I have him castrated or is he too old? What alternative solutions are there? At the moment, when he does it we say "No" and he usually stops, otherwise we push him away and repeat "No" until he stops (usually for about 10 minutes max!).