I am sorry Ajax is not feeling well.
It sounds like he has a disturbance to his equilibrium called Vestibular syndrome.
This disorder is usually caused by a middle ear infection.
Read more on vestibular here
For now you can try dramamine:
If your baby does not improve I am afraid he will need to be seen.
He is an elderly dog so please do not take any chances with him
Dogs can have strokes too:
Please let me know how he is doing.
I hope all will be well.
Warmest best wishes,