Hi, I have a 22 month lab which a recently got from owners who could not keep him any more. For the past three weeks we’ve been trading how to sit- come and lead walking. Today after a 30 minute lead walking training session was over I played catch with a tennis ball justt to have that little extra fun, very soon after he strated jumping on me ( something we are trying to stop for 3 weeks now) nipping on my hand pants shoes bee gone very rough. This was a first I insisted on the command sit he would comply and then jumping nipping and roughness. I had to grab him by the collar to have some control. I don’t understand the roughness
