I brought home at 7 weeks and right from the beginning was on pedigree food, milk and a boiled egg. Was also supplementing with calcium and multivitamin.Two weeks back he reduced his food intake and then changed his food to Drools which he like initially, but reduced that as well. Since then started feeding him boiled chicken, 200 gm with red rice and some vegetable (twice daily) and drools with boiled egg and milk in the morning.His hind leg appears to be weak and his hip sways a quite while walking and doesn't appears normal. While walking his right hind leg hits his leg leg before landing. Whereas his front leg is very strong and quite sturdy. Pl advise.