Hi there, my little one and a half year old frenchie has been acting a little strange lately! He has been really lethargic and pretty much wants to sleep all the time! He no longer wants to run around jump up or stand on his two hind legs? He sometimes whimpers a little when he is lifted or he tries to get up from a laying position, he is eating drinking pooing urinateing and walking normal? Please would you have any idea what could be wrong with him?