Lots of pets worry when left in kennels. Did U take his usual blanket etc., was he fed his usual food? Don't make too much fuss of him as it reinforces his feelings: difficult I know

. Go back to basic training every few hours and gentle commands to regain his focus, he'll be OK in a couple of days. Pets can make us feel guilty - our two cats would run to greet us on our return, then run into the garden to sit with backs turned

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Kennels are a totally different environment: noise, smells, new people ....... make sure that he doesn't have mites between his toes or a grass awl: was he on a concrete floor? Perhaps put something sticky on his paws for him to work at so that he doesn't damage the skin. i.e. honey ;-). Healing all round. Our JR would constantly lick her front paws until they were a kind of pink colour, turned out that there was a mite in her skin.
Vodka - spoils a good vanilla IMO
