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Focalin is a stimulant (an amphetamine), intended to improve sharpness by speeding up mental function. However, in a small, nervous type breed of dog, this can have very serious consequences, including the following:
Hypertension (high blood pressure)
If any adverse signs appear, including but not limited to those above, veterinary attention is necessary. If treated, this probably will not be life threatening, but it could be a serious situation if signs of a problem are ignored.