A. Diazepam is a relatively safe drug if given at appropriate dosage (0.5-2 mg/ kg).Major contraindications are present if your dog is affected by liver diseases, as the diazepam is mainly metabolised through the liver.
Cases of acute liver failure following administration are rare.
Remember that the effect is transient though and sometimes is not enough to cover the length of the travel.
A. Diazepam, when prescribed by your vet and dosed properly, is very safe to give. Your dog may need just a few doses. It is better to medicate than it is to have your dog be stressed the entire time or injure him or herself while boarding.
A. If used in the right dosage and if he really needs it he should be fine, it's a pretty safe drug and some dogs are taking it for long periods of time in some cases. If you want to clear your worries completely request a liver panel blood test from your vet, it's pretty cheap and will give you an idea regarding your dog's liver functions (as Diazepam is contra indicated if the liver is not healthy)
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