Does obedience wear your dog out?

I've upped Joy's obedience training to at least 3 15 - 20 minute sessions a day, in addition to all the momentary "training breaks" we have throughout the day. She seems to really enjoy it, and I feel like we're getting even closer as a result (nice bonus!) but she is even MORE mellow than usual when we're done.

I'm just wondering if your dogs get worn out from obedience training. She doesn't seem over-tired - she's always up for her walks or hikes or games. It's just that she's even more of a fuzzy lump inside the house. I love my fuzzy lump!: