Now, this is a small idea, not fully developed and probably full of kinks to work out:
"Hiring" other players as kennel hands
It can be a feature that will allow a player to: Feed, trial, vaccinate, cure, and (possibly) train another players dog with out needing the dog transfered because the have access to their "employer's" supplies.
I thought of this while I was vaccinating my dogs o-o;;
I realized there were may issues that could happen and thought of things a kennel hand could NOT do:
retire, breed, spay/neuter dogs, transfer items/money/bones/dogs/etc., accept/reject stud requests, and use bones.

There can also be restrictions set:
~Players can only be a kennel hand for the day if the "kennel manager" logs in to pay them (Which could be done automatically if possible).
~Players can't get paid if the don't fulfill all their duties.
~The kennel manager can't give more than 5 jobs to a single kennel hand OR
~ The kennel manager can't assign more than 5 dogs to a single kennel hand to care for OR
The "kennel manager" and "kennel hand" can write up a contract to agree on (Which ever might be more effective on both ends if this is implemented)

Additional ideas to work in some how:
Volunteer Mode: A player can choose to volunteer at a kennel; when doing so, they do one task of their choice (Vaccinate, train, or feed)

I'm still trying to think of ways for this to work out; since it could help a lot of people (People with a lot of dogs and kennel/breeding partners) make their kennels more effective. :)

If you have any suggestions to add to prevent any problems or to make it more successful; feel free to post and I'll edit the ideas in.