Male daschund acting old at 4?
	
	
		My 4yr old male daschund has recently started to seem to be having trouble jumping up on the bed etc. It came on very suddenly, one day he was fine, the next he was hesitating and crying about getting up on the bed. He doesn't yelp when he jumps or anything, he crys because he wants to come up and for some reason he can't jump as high. Is this a sign of an injury or health problem? Is it normal for them to loose some of their mobility at such a young age? 
Any thoughts?