It has been going on since this yesterday evening that I am aware of. He wimpers when i touch him and has trouble climbing stairs or lying down. One apirin tablet and he is 60lbs.
It does sound like it may be an intervertebral disc protrusion which is very painful and can lead to paralysis. He can have 5 mgs per pound of body weight of aspirin 2 times a day so for a 60 pound dog that is and adult aspirin. There are also low dose aspirin so make sure it was the adult aspirin you gave.Rest is very important so if you can confine him in a crate or a very small space that is important.Your veterinarian would diagnose this with xray or MRII am sending a site of a client information sheet on this condition for you to peruse. Let me know if you have questions or concerns after reading it and I will get back toyou. http://www.VeterinaryPartner.com/Content.plx?P=A&A=3223