Hello and welcome to Mack.
Such a sweet old man. Sadly age has got to his hind legs and he has lost muscle and got weak. He has arthritis in them.
But that doesn't mean there is nothing we can do! We have lots of options to give him a new lease of life. Following our long discussion about the home life, past and present. We have done our assessment and first treatment and set him up with a more suitable home regime. This means changing the walk regime to one thats a bit more suited, some diet adjustments and a weightshift excercise to help him build some muscle.
Keep up the good work mum, dad and Mack. We'll have him feeling better soon.