Alfie our 8.5 yr old is always on the go at top speed when off lead (he can still out run all the girls who are younger than him

).
Occasionally after prolonged exercise he would limp or move stiffly the following morning. If this happened i would lead walk him for a few days.
Jennie (poppypuppy09) recommended trying him on Seraquin for his joints.
He has been taking this for over a year now & hasn't limped etc since

I would rest your 3 yr. old for several days with just shortish lead walk's.
If there is no improvement return to your vets next week.
It might be worth looking into giving him some joint supplements if the vet is unable to find an underlying cause.
