If and when you change the puppy feed to a different brand, mix half and half so it is a gradual change and your puppy’s digestive system will adapt to the new feed better.
If the puppy refuses to eat, mix a little water with the feed so it is soft. Your puppy will be eating dry food from the age of 8 weeks.
Have feed and fresh water available to the puppy at all times.
REST AND RECREATION
It is very important for your puppy to get six hours of rest for every one-hour of playtime. If your puppy gets worn down from too much playtime it may become stressed. Playtime to rest time may be increased, as the puppy gets older.
PRECAUTIONARY
In case of stress give the puppy a dose of Nutri-Cal. This is only precautionary and may never become a problem if the puppy is not stressed. When in doubt always give 1 to 2 drops.
Hypoglycemia is a problem, which may or may not affect your pet and is common in all toy breeds normally due to negligence of its owner. It is important to provide proper electrolytes and a vitamin supplement such as Nutri-Cal (which will be provided at time of purchase). For the first 5 days we highly recommend giving your puppy 1 to 2 drops twice daily to aid in the transition period.
At bath time put a drop of mineral oil in each eye to protect puppies eyes from shampoos and try not to get water inside the ears.
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I found the above at a local breeder's website and thought it might help you, too. Is this your first yorkie? I know you must be excited.